Why are rolling averages useful
Rolling averages and Rolling totals are used when analysing data over time
Rolling averages smooth out fluctuations across the number of periods
Both of these are possible in Power BI if you know the steps involved
How to create rolling averages in Power BI
Power BI has a really helpful feature called quick measures
You can use a quick measure to create a rolling average in Power BI
Quick measures are a commonly used set of calculations, which simplify the DAX coding when you need to create some of the more complex measures. They are also a great way of learning DAX coding
Click on the Quick measures icon
In calculations, scroll down to
‘Rolling Average’
Add the value to measure and the date
Then in periods, set your period interval from days, months quarters or years
Then set the number of periods before and after
Click OK
After you click ok the DAX code is generated for you and the new measure is created
You can now use this field on your visuals
How to create rolling sums in Power BI
By default, Power BI does not have a quick measure for the rolling sum, but to save time, just create a rolling average, then edit the DAX code
Change the highlighted fields
The first one is the name of the measure, so change it from Average to Sum
The second one needs to change the AVERAGEX function to use a SUMX
The press enter
You now have a rolling SUM measure in Power BI
A word of caution though, you can see on the chart that the first periods don’t contain the three periods, so you may need to exclude those from the chart
Conclusion
Having the ability to add a rolling average or rolling sum to Power BI reports helps to smooth out fluctuations and present a more stable result set
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