I'm something of a PowerBI Desktop and DAX newbie, so please excuse me if this question is really simple.
I have five guys working for me, and I would like to create a visual that shows the number of calls each indivdiual handle per month on average, the average calls handled per month per person across the entire group, and finally the average calls plus one standard deviation and minus one standard deviation. I am able to do this in Excel, but I can't make it happen in PowerBI. The way the math works, I can figure out the average pretty easy. I'll just create one average measure for each individual, and then find the average of the five individual average measures. However in order to determine the standard deviation I need to figure out a way to feed all the values within a specifc column across five tables into one of the STDEV variants. I would very much like to do this in a way allows me to filter, and the average of averages updates as well as the STDEV.
My data is seperated into a table for each guy, and looks something like this:
Year Month Number of Calls
2016 Jan 455
2016 Feb 500
Thanks!