Past 3 months average showing incorrect values

[Anonymous]

Hi 

I am new to Power BI and I need help with the correct measure for showing the past 3,6,9,&12 months average sales.

I have Customer,Product Category,Month (which I turned into the calender table) and a sales Column.

Customer	Category	Month (Real)	Sales
x	Baby Care	2021M06	3,8542
x	Personal Care	2020M11	18,3093
y	Baby Care	2020M05	24,1079
y	Feminine Care	2020M03	26,9695
x	Baby Care	2021M06	5,4637

My problem is that when I calculate the average,I always get the incorrect values or I get the same value for all the product categories.

This is the measure I used

P3M Avg Sales = CALCULATE(SUM(Query1[Sales MSU]),DATESINPERIOD(Query1[Month],LASTDATE(Query1[Month]),-3,MONTH))/3

[Anonymous]

@Anonymous 

Here's how such calculations should look like and what a good model is (yours is not):

https://youtu.be/ACvYaXnpyCM

Let me also say it clearly:

If your model is incorrect, you can't use the time-intel functions in it, simply because you will never get correct answers. And if you by some chance will.... it'll be purely by chance and you won't be able to trust the results.

I hope this clarifies this subject.