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FAQs
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What are your most profoundly helpful definitions of Art that explain its meaning best to you in one sentence or less?
Art is simply the expression of an idea intended to be experienced. A lot of times people confuse the issue by stating that art has to demonstrate talent, or it has to be beautiful. Those are judgements. Art can be beautiful and it can demonstrate talent, but it can also be ugly and it can be as simple as arranging a couple of found objects. Art can be, in its purest sense, simply the act of creating for no other reason than for the intention of being art. Its audience may be vast or it may only be the artist who created it. Art can be very complicated, it can be utilitarian, it can be vague, it can be timeless and it can be fleeting. It can be all of these things and none of them. Art is defined by the act of its creation, not necessarily by anyone else.
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What will the e-signing landscape look like in 3-5 years time?
Most importantly, we will grow from where we are today (about 1% of all contracts signed on the web) to 50%+ (the majority) in 4-6 years. The broader market will grow 50x, and with that, the market will fundamentally change.At a product/technical level, there will be at least 3 important evolutions as the % of contracts signed on the web that we see at EchoSign:Seamless web workflow (integrations). Today, it's still relatively nichey to, for example, create a document in Google Docs or pull a form from DropBox or Box.net, review/edit/collaborate on the document, send it out to get signed, and then have it all stored on the web, in the cloud. In 3-5 years, the entire contracting workflow and process will be 100% web and cloud based.100% web-based contract. Today, only a minority of e-signed contracts are created purely on the web. Instead, most contracts are still local content - a local PDF, or a local Word document. In 3-5 years, the contract will be 100% web-based and completely abstracted from not only paper, but from an off-line contract creation process. This makes e-signatures a requisite, not optional, part of the contracting process.Dramatically more functionality. From a functionality perspective, the solutions and market are still at a nascent stage. As the market grows 50x in the next few years, the demands for functionality will grow 50x. Whether it's basic things like HTML5 support for e-signing on the iPad, or tailoring the electronic signature experience in real-time based on the country the signer is in, or bigger changes, like true web-based contract collaboration, the bar will continue to go up.Because of this, the market is likely to end up with "2.5" leading players. E-signatures and e-contracting are too nuanced, and require too much workflow and too high a level of user-specific functionality, to become just a feature of another solution. The level of solution complexity certainly is not as high as standalone CRM, for example (where competing with Salesforce.com at this point is impractical), but it is much higher than simple web apps (e.g., document or content storage) or even web conferencing/collaboration (WebEx/GoToMeeting/etc.). The solutions also benefit from scale and users, but do not have a true network effect. Also, electronic signatures have a signNow legal component, which creates challenges to immature products.Thus, 4-5 years out (perhaps not 3), we are likely to see (x) e-signatures having become the primary way contracts are signed, period, with (y) a few leaders (a la WebEx and GoToMeeting) whose products are deeply integrated with, but not subsumed by, the workflows and integrations of the web, along with a few smaller players with niche offerings and relatively small customer bases.
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Has dolphin communication been decoded at least partially?
Dolphins language is open and hierarchically organised like ours.We only have deciphered the meaning of signature whistles. Dolphins use signature whistles in a way quite similar to our names to identify individual dolphins or groups of dolphins. Those are the only dolphins “words” that its meaning was deciphered and the simpler signals that dolphins produce.In 1990 Alexander V. ZaninVladimir I. MarkovIrina E. Sidorova published a paper called “The Ability of Bottlenose Dolphins, Tursiops Truncatus, to Report Arbitrary Information” They have done experiments that demonstrated dolphins have ...
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How do I apply for PAN card online? What is the eligiblity for applying for it?
Online PAN application procedure is very simple. You can follow the below mentioned steps and get done with it. You can apply for a PAN online through NSDL portal, refer the following steps:1. Select Application type: for Indian Citizens- Form 49A and Form 49AA for Foreign Citizens.2. Fill in your personal details3. Submit your documents: Upload scanned documents, or e-KYC or e-Signature: Recommended if you have an Aadhar Card4. Pay fees: through Demand Draft, Debit/Credit card or Net-Banking only.5. After successfully submitting your application and payment of fees, you will receive an acknowledgement number. This number can be used to track your PAN application.Talking about the terms and conditions one must fulfill in order to be eligible for a PAN card are:-1. You must be an Indian by nationality.2. There is no minimum age. Though you must know the application process in case of a minor applying for a PAN card is completely different compared to an adult.Lastly, you need the following documents to apply for a PAN card.Proof of IdentityProof of AddressProof of Date of birthP.S: Entities like Dealers, Manufacturers, Service Providers, Trusts, etc along with individuals can apply for a PAN.
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What are some lesser known Gmail tips?
Perhaps not "lesser known", but I've been using keyboard shortcuts for years under "Settings": This probably comes from my vim background, but inside gmail, I almost never use the mouse. Instead:While viewing a list of threads (i.e. Inbox, All Mail, Drafts, search results, etc.):c to compose a new mailj and k to move the cursor down and upx to select/deselect the current thread that's pointed to by the cursore to archive all threads that have been selected [Enter] to go into the thread pointed to by the cursor"g i" to go to my Inbox"g a" to go to All Mail"g d" to go to DraftsWhile inside a thread:n and p to browse down and up messages inside a thread (move the cursor up and down)a to reply all (or r to reply individually, but that's rare) to the message currently pointed to by the cursorf to forward the message that's pointed to by the cursoru to go back to the previous thread list view, which could be your Inbox, All Mail, Drafts, etc. This is the same as the back button: s to toggle through the stars on the message currently pointed to by the cursorIn case you're wondering, the "cursor" is the very thin vertical blue line visible to the left of the third thread in this picture:Other useful shortcuts:/ to make the search bar active"* u" to select all unread emails"* n" to deselect all emailsShift+i to mark all selected emails as readShift+u to mark all selected emails as unreadWhile inside a thread, Shift+u will bring you back to the previous thread list view and marking the current thread as unread. I do this a lot to keep important threads at the top of my inbox.And that's basically all I ever do in gmail. It can be painful to learn at first, but just start with the very basics: j, k, and [Enter] to browse through your inbox. Within a month or two, you'll be zipping through your inbox like Usain Bolt through the 200m.Full list: http://support.google.com/mail/b...Edit: David Craige mentioned a very useful Google Labs add-on under "Settings --> Labs": a [Send & Archive] buttonAnd another useful add-on:
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How does GDPR affect Sales Development that doesn't buy lists but uses publicly available information like LinkedIn and Zoominfo
There are many aspects to GDPR. The two main ones being:1) getting consent from users to collect and use their data, and2) storing that data securely and only as long as necessary).However, that not only impacts marketing channels and processes, but also SALES and how you generate cold leads (e.g. through public sources).Salespeople must be aware of the implications of GDPR and comply with them, just like marketing-people.For salespeople that mainly affects 3 areas:Getting consent from users to collect and use their data, e.g. through esignatures and electronic contracts. (Using public data does not mean you can automatically contact them directly)Storage of customer data (e.g. CRMs)Using legal and GDPR-compliant contracts with customersIn my understanding, using public data still violates with 1): The contact still hasnt given you the right to contact him! In fact, not even a simple signup through an email form necessarily gives you the right to contact him. You still need a) inform him BEFOREHAND how you are going to use and store his data and b) send him a double opt-in email (if you want to be on the safe side)However, there are even more aspects that salespeople need to care about when it comes to GDPR.Lets have a closer look.Using cloud-solutions to ‘outsource’ the technical liability of data storageOne way to ‘easily’ become GDPR compliant in data storage, is by ‘outsourcing’ a majority (or all) of the data storage into the cloud, e.g. by using a cloud-based CRM over storing customer data on your local drive in an excel spreadsheet. That way, the cloud provider will have to ensure that the data is stored securely; has to put the necessary technical requirements into place to allow users to be forgotten; is the one who has to report and be liable for any data bsignNowes; etc. You are basically shifting the responsibility to somebody else.Getting consent from users to collect and use data, esignatures can be one solutionThere’s many ways to get the consent of a user to send him promotional material or cold emails. GDPR defines requirements for obtaining consent to process an individual’s personal data. This consent must be specific, informed, unambiguous, freely given, and documented. e-signatures can help to making sure this is the case. We make it easier to obtain affirmative consent at the point of data collection – in real-time.Ensure the use of GDPR compliant contracts throughout the sales teamIf you are managing a large sales team it might be difficult to ensure everybody is using the latest contract templates. What if they send out an outdated version that is not GDPR-compliant? A digital contract management platform[1] can help by only allowing salespeople to use certain contract templates without the option to edit certain legal terms of the contract.I wrote a blog article that goes into more detail how cloud solutions can help salespeople be GDPR compliant, specifically with digital contract management platforms: Sales organizations need to comply with GDPR. This is what you need to do with your sales contracts. | Accordium - Agree FasterFULL DISCLOSURE: Im co-founder of Accordium, a sales automation and digital contract platform.Footnotes[1] Home | Accordium - Agree Faster
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What are probabilistic graphical models, and why are they useful?
These are Probabilistic Graphical Models. They are arguably our most complete and promising toolkit for inferring truth from complexity. They're born from a single set of principles that endow our machines to dominate chess, diagnose disease, translate language, decipher sound, recognize images and drive cars. 'Neural Networks' and 'Probabilistic Programming' are famous signatures of the Machine Learning community simply because they are effective tool sets for applying these devices.My aim here is to reveal the machinery behind this magic. I intend to show what they are, why we use them and how we actually use them. To do that, I’ve answered seven questions on this subject:What are Probabilistic Graphical Models and why are they useful?What is 'exact inference' in the context of Probabilistic Graphical Models?What is Variance Inference in the context of Probabilistic Graphical Models?How are Monte Carlo methods used to perform inference in Probabilistic Graphical Models?How are the parameters of a Bayesian Network learned?How are the parameters of a Markov Network learned?How is the graph structure of Probabilistic Graphical Models learned?I realize this is a ton to digest, especially for internet browsing, but allow me to sell you. This information is typically delivered with a worthwhile 1000+ page textbook to graduate computer scientists. We can 80/20 these ideas with just a few answers! It'll take discipline, but you'll gain a surprisingly good understanding of an absolutely foundational theory of Machine Learning.As a compromise, I've structured things such that you need only read a subset of these answers to get a full picture. Here's a map of that structure:For example, if you read [math]1 \rightarrow 2 \rightarrow 6 \rightarrow 7[/math], you'll get a complete taste. Also, I'll include refreshers at the beginning of each answer - this should make things more self contained. (If you read these answers in sequence, I'd skip those refreshers, as they will sound redundant.)If this sounds like a good deal to you, please follow those questions!Now, let's start walking.Notation GuideAs a first stop, we'll review notation, an admittedly boring place. But, it's my unconventional belief that most confusion is due to notation. So if we wish to survive, we'll need a few tips:An upper case non-bold letter indicates a single random variable ('RV'). The same letter lower cased with a super script indicates a specific value that RV may take. For example, [math]X=x^1[/math] is the event the RV [math]X[/math] took on the value [math]x^1[/math]. We call this event an assignment. The set of unique values an RV may take is [math]Val(X)[/math]. So we might have [math]Val(X)=\{x^0,x^1\}[/math] in this case.A bold upper case letter indicates a set of RVs (like [math]\mathbf{X}[/math]) and a bold lower case letter indicates a set of values they may take. For example, we may have [math]\mathbf{X}=\{A,B\}[/math] and [math]\mathbf{x}=\{a^3,b^1\}[/math]. Then the event [math]\mathbf{X}=\mathbf{x}[/math] is the event that [math]A=a^3[/math] happens and [math]B=b^1[/math] happens. Naturally, [math]Val(\mathbf{X})[/math] is the set of all possible unique joint assignments to the RVs in [math]\mathbf{X}[/math].If you see [math]\mathbf{x}[/math] (or [math]\mathbf{y}[/math] or [math]\mathbf{z}[/math] etc...) within a probability expression, like [math]P(\mathbf{x}|\cdots)[/math] or [math]P(\cdots|\mathbf{x})[/math], that's always an abbreviation of the event '[math]\mathbf{X}=\mathbf{x}[/math]'.Perhaps confusingly, we also abbreviate the event '[math]\mathbf{X}=\mathbf{x}[/math]' as '[math]\mathbf{X}[/math]', though this isn't a clean abbreviation. Omission of [math]\mathbf{x}[/math] means one of two things: either we mean this for any given [math]\mathbf{x}[/math] or for all possible [math]\mathbf{x}[/math]'s. As an example for the latter case, 'calculate [math]P(\mathbf{X})[/math]' would mean calculate the set of probabilities [math]P(\mathbf{X}=\mathbf{x})[/math] for all [math]\mathbf{x}\in Val(\mathbf{X})[/math].[math]\sum_\mathbf{X}f(\mathbf{X})[/math] is shorthand for [math]\sum_{\mathbf{x}\in Val(\mathbf{X})}f(\mathbf{X}=\mathbf{x})[/math]. This is similarly true for [math]\prod_\mathbf{X}(\cdot)[/math] and [math]\textrm{argmin}_\mathbf{X}(\cdot)[/math]. Look out for this one - it can sneak in there and change things considerably.You may see equations like [math]f(A,B,C)=g(\mathbf{X})h(\mathbf{Y})[/math]. They look strange - the RVs on the left aren't on the right! Well, in such cases, you also have something like [math]\mathbf{X} = \{A,B\}[/math] and [math]\mathbf{Y} = \{B,C\}[/math]. So the equation really is [math]f(A,B,C)=g(A,B)h(B,C)[/math].Probability distributions are references with a [math]P[/math], [math]\textrm{Q}[/math], [math]q[/math] or [math]\pi[/math]. Keep in mind that distributions are a special kind of function. Remember that!Everything is in reference to the discrete case. Unfortunately, the continuous case is not a simple generalization from the discrete case. The minor exception is in the visuals. The discrete case is less friendly to graphs, so I might use some continuous distributions. As it relates to the discussion, pretend these are in fact discrete distributions with a fine granularity.Almost all of this notation comes from the text Probabilistic Graphical Models - one of those 1000 page monsters. That book is extremely thorough, and should be considered stop number 8.Still here? You must have discipline! Onto the fun stuff - we ask:What generic problem do PGMs address?Our goal is to understand a complex system. We assume the complex system manifests as [math]n[/math] RVs, which we may write as [math]\mathcal{X} = \{X_1,X_2,\cdots,X_n\}[/math] [1][2]. We take it that 'a good understanding' means we can answer two types of questions accurately and efficiently for these RVs. If we say [math]\mathbf{Y}[/math] and [math]\mathbf{E}[/math] are two given subsets of [math]\mathcal{X}[/math], then those questions are:Probability Queries: Compute the probabilities [math]P(\mathbf{Y}|\mathbf{E}=\mathbf{e})[/math]. That is, what is the distribution of the RV's of [math]\mathbf{Y}[/math] given we have some observation of the RVs of [math]\mathbf{E}[/math]?MAP Queries: Determine [math]\textrm{argmax}_\mathbf{Y}P(\mathbf{Y}|\mathbf{E}=\mathbf{e})[/math]. That is, determine the most likely assignments of RVs given an assignment of other RVs.Before continuing, we should point a few things out:Since [math]\mathbf{Y}[/math] and [math]\mathbf{E}[/math] are any two subsets of [math]\mathcal{X}[/math], there is potentially a remaining set (call it [math]\mathbf{Z}[/math]) that's in [math]\mathcal{X}[/math]. In other words, [math]\mathbf{Z} = \mathcal{X} - \{\mathbf{Y},\mathbf{E}\}[/math]. This set appears left out of our questions, but is very much at play. We have to sum these RVs out, which can considerably complicate our calculations. For example, [math]P(\mathbf{y}|\mathbf{e})[/math] is actually [math]\sum_\mathbf{Z}P(\mathbf{y},\mathbf{Z}|\mathbf{e})[/math].We haven't mentioned any model yet. This set up is asking generically for probabilities and values that accurately track reality.To this end, we are assisted by the fact that we have some, at least partial, joint observations of [math]\mathcal{X}[/math]. However, some of our [math]n[/math] RVs may never be observed. These are called 'hidden' variables and they will complicate our lives later on.This set up is extremely general, and as such, this problem is extremely hard.The problem with joint distributions.Our starting point, perhaps surprisingly, will be to consider the joint distribution of our RVs [math]\mathcal{X}[/math], which we aren't given in real application (but we'll get there). We'll call that joint distribution [math]P[/math]. Conceptually, we can think of this as a table that lists out all possible joint assignments of [math]\mathcal{X}[/math] and their associated probabilities. So if [math]\mathcal{X}[/math] is made up of 10 RVs, each of which can take 1 of 100 values, this table has [math]100^{10}[/math] rows, each indicating a particular assignment of [math]\mathcal{X}[/math] and it's probability.The issue is, for a complex system, this table is too big. Even if we had the crystal ball luxury of having [math]P[/math], we can't handle it. So now what?The Conditional Independence statementWe need a compact representation of [math]P[/math] - something that gives us all the information of that table, but doesn’t involve writing it down. To this end, our saving grace is the Conditional Independence (CI) statement:Given subsets of RVs [math]\mathbf{X}[/math], [math]\mathbf{Y}[/math] and [math]\mathbf{Z}[/math] from [math]\mathcal{X}[/math], we say [math]\mathbf{X}[/math] is conditionally independent of [math]\mathbf{Y}[/math] given [math]\mathbf{Z}[/math] if[math]P(\mathbf{x},\mathbf{y}|\mathbf{z})=P(\mathbf{x}|\mathbf{z})P(\mathbf{y}|\mathbf{z})\tag*{}[/math]for all [math]\mathbf{x}\in Val(\mathbf{X})[/math], [math]\mathbf{y}\in Val(\mathbf{Y})[/math] and [math]\mathbf{z}\in Val(\mathbf{Z})[/math]. This is stated as '[math]P[/math] satisfies [math](\mathbf{X}\perp \mathbf{Y}|\mathbf{Z})[/math][3]'Now, if we had sufficient calculation abilities, we could calculate the left side and the right side for a distribution [math]P[/math]. If the equations hold for all values, then, by definition, the CI statement holds. Intuitively, though not obviously, this means that if you are given the assignment of [math]\mathbf{Z}[/math], then knowing the assignment of [math]\mathbf{X}[/math] will never help you guess [math]\mathbf{Y}[/math] (and vice versa). In other words, [math]\mathbf{X}[/math] provides no information for predicting [math]\mathbf{Y}[/math] beyond what [math]\mathbf{Z}[/math] has. Similarly, you can't predict [math]\mathbf{X}[/math] from [math]\mathbf{Y}[/math] any better.Knowing such statements turns out to be massively useful - they give us that compact representation we need. To see this, let's say [math](X_i \perp X_j)[/math] for all [math]i \in \{1,\cdots,10\}[/math] and [math]j \in \{1,\cdots,10\}[/math] where [math]i\neq j[/math]. This is to say, all RVs are independent of all other RVs. It turns out that with these statements, we only need to know the marginal probabilities of each value for each RV (which is a total of [math]10\cdot 100=1000[/math] values) and may reproduce all the probabilities of [math]P[/math]. So if we are considering the case where [math]\mathbf{X}=\mathcal{X}[/math] and would like to know the probability [math]P(\mathbf{X}=\mathbf{x})[/math], we simply return [math]\prod_{i=1}^{10}P(X_i=x_i)[/math], where [math]x_i[/math] is the [math]i[/math]-th element of [math]\mathbf{x}[/math].Though this isn't just a save on storage. This is a simplification on [math]P[/math] that will ease virtually any interaction with [math]P[/math], including summing over many assignments and finding the most likely assignment. So at this point, I'd like you to think that CI statements regarding [math]P[/math] are a requirement for wielding it.Now put a pin in this and let's switch gears.The Bayesian NetworkIt's time to introduce the first type of PGM - the Bayesian Network ('BN'). A BN refers to two things, both in relation to some [math]\mathcal{X}[/math]: a BN graph (called [math]\mathcal{G}[/math]) and an associated probability distribution [math]P_B[/math]. [math]\mathcal{G}[/math] is a set of nodes, one for each RV of [math]\mathcal{X}[/math], and a set of directed edges, such that there are no directed cycles. Said differently, it's a DAG. [math]P_B[/math] is a distribution with probabilities for assignments of [math]\mathcal{X}[/math] using a certain rule and Conditional Probability Tables ('CPTs' and 'CPDs'), which augment [math]\mathcal{G}[/math]. That rule, called the 'Chain Rule for BNs', for determining probabilities can be written:[math]P_B(X_1,\cdots,X_n)=\prod_{i=1}^n P_B(X_i|\textrm{Pa}_{X_i}^\mathcal{G})\tag*{}[/math]where [math]\textrm{Pa}_{X_i}^\mathcal{G}[/math] indicates the set of parent nodes/RVs of [math]X_i[/math] according to [math]\mathcal{G}[/math]. The CPDs tell us what the [math]P_B(X_i|\textrm{Pa}_{X_i}^\mathcal{G})[/math] probabilities are. That is, a CPD lists out the probabilities of all assignments of [math]X_i[/math] given any joint assignment of [math]\textrm{Pa}_{X_i}^\mathcal{G}[/math][4]. These CPDs are the parameters of our model. Their form is to list out actual conditional probabilities from [math]P_B[/math].To help, let's consider a well utilized example from that monstrous text: the 'Student Bayesian Network'. Here, we're concerned with a system of five RVs: a student's intelligence ([math]I[/math]), their class's difficulty ([math]D[/math]), their grade in that class ([math]G[/math]), their letter of recommendation ([math]L[/math]) and their SAT score ([math]S[/math]). So [math]\mathcal{X}=\{I,D,G,L,S\}[/math]. The BN graph along with the CPDs can be represented as:According to our rule, we have that any joint assignment of [math]\mathcal{X}[/math] factors as:So we would calculate a given assignment as:Not too bad, right? All this is to show is that a BN along with CPDs gives us a way to calculate probabilities for assignments of [math]\mathcal{X}[/math].Now we're ready for:The big idea.It's so big, it gets its own quote block:The BN graph, just those nodes and edges, implies a set of CI statements regarding it's accompanying [math]P_B[/math].It's a consequence of the Chain Rule for calculating probabilities. As a not-at-all-obvious result, a BN graph represents all [math]P[/math]'s that satisfy these CI statements and each of those [math]P[/math]'s could be attained with an appropriate choice of CPDs.For a BN, one form of those CI statements are:[math](X_i \perp\textrm{NonDescendants}_{X_i}|\textrm{Pa}_{X_i}^\mathcal{G})[/math] for [math]X_i \in \mathcal{X}[/math]So in the student example, we'd have this set:The third statement tells us that if you already know the student's intelligence and their class's difficulty, then knowing their SAT score won't help you guess their grade. This is because the SAT score is correlated with their grade only via their intelligence, and you already know that.These are referred to as the local semantics of the BN graph. To complicate matters, there are almost always many other true CI statements associated with a BN graph outside of the local semantics. To determine those by inspecting the graph, we use a scary 'D-separation' algorithm that I will shamelessly not explain.There is a reason this is so important. Since a BN graph is a way of representing CI statements and such statements are a requirement for handling a complex system's joint distribution (if you had it), then this is a good reason to use a BN to represent such systems. If we can accurately represent a system with a BN, we will be able to calculate our probability and MAP queries. Therefore, BNs will solve our problems when we're dealing with a certain class of [math]P[/math]'s. This choice, unsurprisingly, is called our representation.But there's an issue - I said a 'class' of [math]P[/math]'s. It's not hard to invent [math]P[/math]'s that come with CI statements a BN cannot represent.So now what? Well, we have other tools, the biggest of which is...The Markov NetworkA Markov Network ('MN') is likewise composed of a graph ([math]\mathcal{H}[/math]) and a probability distribution ([math]P_M[/math]). Though this time, the graph's edges are undirected and it may have cycles. The consequence is that a MN can represent a different set of CI statements. But, the lack of directionality means we can no longer use CPDs. Instead, that information is delivered with a factor, which is a function (function! remember it) that maps from an assignment of some subset of [math]\mathcal{X}[/math] to some nonnegative number. These factors are used to calculate probabilities with the 'Gibbs Rule'[5].To understand the Gibbs Rule, we must define a complete subgraph. A ‘subgraph’ is exactly what it sounds like - we make a subgraph by picking a set of nodes from [math]\mathcal{H}[/math] and including all edges from [math]\mathcal{H}[/math] that are between nodes from this set. A 'complete' graph is one which has every edge it can - each node has an edge to every other node.Now, let's say [math]\mathcal{H}[/math] breaks up into a set of [math]m[/math] complete subgraphs. By 'break up', I mean that the union of all nodes and edges across these subgraphs gives us all the nodes and edges from [math]\mathcal{H}[/math]. Let's write the RVs associated with the nodes of these subgraphs as [math]\{\mathbf{D}_i\}_{i=1}^m[/math]. Let's also say we have one factor (call it [math]\phi_i(\cdot)[/math]) for each of these. We refer to these factors together with [math]\Phi[/math], so [math]\Phi=\{\phi_i(\cdot)\}_{i=1}^m[/math]. For terminology's sake, we say that the 'scope' of the factor [math]\phi_i(\cdot)[/math] is [math]\mathbf{D}_i[/math] because [math]\phi_i(\cdot)[/math] takes an assignment of [math]\mathbf{D}_i[/math] as input.Finally, the Gibbs Rule says we calculate a probability as:where(It's hidden from this notation, but we're assuming it's clear how to match up the assignment of [math]X_1,\cdots,X_n[/math] with the assignments of the [math]\mathbf{D}_i[/math]'s.)Wait - the MN was introduced because it represents a different set of CI statement. So, which ones? It's considerably simpler in the case of a MN. A MN implies the CI statement [math](\mathbf{X} \perp \mathbf{Y}|\mathbf{Z})[/math] if all paths between [math]\mathbf{X}[/math] and [math]\mathbf{Y}[/math] go through [math]\mathbf{Z}[/math]. Easy!Now let's get specific. Below is an MN for the system [math]\mathcal{X}=\{A,B,C,D\}[/math] and the CI statements it represents:As you may notice, it's not hard to write those CI statements by viewing the graph.While we're here, let's write out the Gibbs Rule. By looking at this, we could identify our complete subgraphs as: [math]\{\{A,B\},\{B,C\},\{C,D\},\{D,A\}\}[/math]. With that, we calculate a probability as:whereTo repeat, each [math]\phi_i(\cdot,\cdot)[/math] is just a function that maps from it's given joint assignment to some nonnegative. So if [math]A[/math] and [math]B[/math] could only take on two values each, [math]\phi_1(\cdot,\cdot)[/math] would relate the four possible assignments to four nonnegative numbers. These functions serve as our parameters just as the CPDs did. Determining these functions brings us from a class of [math]P[/math]'s to a specific [math]P[/math] within it, defined with probabilities.But, ahem, uhh… there's an issue. In the BN case, I said:As a not-at-all-obvious result, a BN graph represents all [math]P[/math]'s that satisfy its CI statements and each of those [math]P[/math]'s could be attained with an appropriate choice of CPDs.The analogous is not true in the case of MNs. There may exist a [math]P[/math] that satisfies the CI statements of a MN graph, but we can't calculate it's probabilities with the Gibbs rule. Damn!Fortunately, these squirrely [math]P[/math]'s falls into a simple, though large, category: those which assign a zero probability to at least one assignment. This leads us to the Hammersley-Clifford theorem:If [math]P[/math] is a positive distribution ([math]P(\mathbf{X}=\mathbf{x})>0[/math] for all [math]\mathbf{x} \in Val(\mathcal{X})[/math]) which satisfies the CI statements of [math]\mathcal{H}[/math], then we may use the Gibbs Rule, along with a choice of complete subgraphs and associated factors, to yield the probabilities of [math]P[/math]. [6]And that about does it for the basics of MNs. They are just another way of representing another class of [math]P[/math]'s.How do BNs and MNs compare?At this point, we're not evolved enough for a full comparison, so let's do a partial one.First, it's clearly easier to determine CI statements in a MN - no fancy D-separation algorithm required. This follows from their simple symmetric undirected edges, which make them a natural candidate for certain problems. Broadly, MNs do better when we have decidedly associative observations - like pixels on a screen or concurrent sounds. BNs are better suited when we suspect the RVs attests to distinct components of some causal structure. Timestamps and an outside expectation of what's producing the data are helpful for that.Also, there's a certain overlap between a MN and a BN that'll unify our discussion in later answers. That is, the probabilities produced by the Chain Rule of any given BN can be exactly reproduced by the Gibbs Rule of a specially defined MN. To see this, look at the Chain Rule - [math]P_B(X_i|\textrm{Pa}_{X_i}^\mathcal{G})[/math] is just the conditional probability of some (unspecified) [math]X_i[/math] value given some assignment of the parent RVs. Well, to translate this to the Gibbs Rule, let [math]\mathbf{D}_i=\{X_i\}\cup\textrm{Pa}_{X_i}^\mathcal{G}[/math]. Next, define [math]\phi_i(\mathbf{D}_i)[/math] to produce the same output you'd get from looking up the BN conditional probability in the CPD (which is [math]P_B(X_i|\textrm{Pa}_{X_i}^\mathcal{G})[/math]). Awesome - now the Gibbs Rule is the same expression as the Chain Rule. This is useful because we can speak solely in terms of the Gibbs Rule and whatever we discover, we know will also work for the Chain Rule (and hence BNs). What this doesn't mean is that MNs are a substitute for BNs. If you were to look at this invented MN, it would likely imply way more edges in its graph and therefore, fewer CI statements and therefore, a wider and more unwieldy class of [math]P[/math]'s. In other words, BNs are still useful representations.But there's more to learn.Let's say we determined our graphical model along with its parameters. How do we actually answer those queries? Well, I have three suggestions:2. What is 'exact inference' in the context of Probabilistic Graphical Models?3. What is Variance Inference in the context of Probabilistic Graphical Models?4. How are Monte Carlo methods used to perform inference in Probabilistic Graphical Models?Footnotes[1] This is the one exception where we don't refer to a set of RVs with a bold uppercase letter.[2] This actually isn't the fully general problem specification. In complete generality, the set of RVs should be allowed to grow/shrink over time. That, however, is outside what I expect to accomplish in these posts.[3] There is a subtlety of language here. Often we'll say '[math]P[/math] satisfies these CI statements'. That means those CI statements are true for [math]P[/math], but others may be true as well. So it means 'these CI statements' are a subset of all [math]P[/math]'s true CI statements. This technicality matters, so keep an eye out for it.[4] If [math]X_i[/math] doesn't have any parents, then the CPD is the unconditional probability distribution of [math]X_i[/math].[5] This isn't a real name I'm aware of, but the form of that distribution makes it a Gibbs distribution and I'd like to maintain an analogy to BNs, which had the Chain Rule.[6] The implication goes the other way as well: If the probabilities of [math]P[/math] can be calculated with the Gibbs Rule, then it's a positive distribution which satisfies CI statements implied by a graph which has complete subgraphs of RVs that correspond to the RVs of each factor. This direction, however, doesn't fit into the story I'm telling, so it sits as a lonely footnote.Sources[1] Koller, Daphne; Friedman, Nir. Probabilistic Graphical Models: Principles and Techniques (Adaptive Computation and Machine Learning series). The MIT Press. Kindle Edition. This is the source of the notation, the graphics in this answers (with permission) and my appreciation for this subject.
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