Calculated Column by distinct month

[jamesrr25]

 Hello, I am attempting to create a calculated column to indicate the average of Rate by Month. I believe it should look something similar to the following, but I know the expression in the filter function is incorrect.

=Average(Filter('datamodel',[Month] = [Month]),[Rate])

What I am trying to do with this expression in the filter function is indicate that we only want the average for each distinct month. The bolded portion of the function is where I believe I am going wrong here and could use some assistance.

FYI - I have seen examples of this function with the month indicated, but I will not be able to do so with my example. The formula just needs to know that it takes the average of Rate in the 'datamodel' for a distinct month.

Thank you!

[Phil_Seamark · Accepted solution]

Hi @jamesrr25

Please try this

Column = CALCULATE(
                AVERAGE([Rate]) , 
                Filter('datamodel','datamodel'[Month] = EARLIER('datamodel'[Month])
                )
        )

[jamesrr25]

Thank you @Phil_Seamark ! This worked perfectly.

I have never used the Earlier function and am reading up on it some more. Very interesting! Have a fantastic day.