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so our objective now is probably can be described as uh so let's say we want to do month on month variance of course month or month variance is going to be reported on a current month so for example if i am on if i'm in may now and i want to calculate month or month variance i will need to stay in may but i will need to have access to april's numbers unfortunately power bi is not going to allow that because everything works in measures based on filters context so and may is what is currently filtered it cannot see april so i'll need to manipulate the filter context for us to be able to see april why we are sitting in may and that's why we have the calculate function so let's see let's go and calculate previous month revenue so right click on orders click on new measure and we call this previous month previous month revenue so previous month revenue is going to be equals to want to manipulate the fuel tax context so we have to start with calculate so calculate expression is what am i calculating what calculation do i want to manipulate the context for i want to manipulate the context for the revenue that i'm currently reporting so that's my expression now revenue which i've written earlier so calculate revenue comma so the filter now is what filters do i want to use in this new manipulation this new thing that i want to visualize what do i want to see there so let me go to the other line to write that one so my filter now is i need a function that can help me know which month do i currently have selected so that i can just go and pick the month before it okay so that's previous month function so previous month function you can see the other uh variance of previous you can calculate for previous day you can calculate for previous quarter and previous year so in this case we're using previous month so previous month function requires just a single argument and that's dates and where's our dates we have our dates on the calendar table so calendar date close the brackets here for previous month and go to the next line cross the one for calculate and when i hit enter and i look for the measure to add to my reports previous month so check the box you can see that january is blank our first data starts in january 2014 so there is no previous month and obviously you can see that for each month now it is repeating the value for a previously selected month so now we need to understand what was the previous month function do so let's go and select the measure again and understand what previous month function does so previous month function typically is going to go and find out first which year...