DAX for averages on a sum of slicer selection

[TimHuijsmans]

I have 4 timeseries with a date, region and value column in a single table where the region column identifies the timeseries. I want to plot the values as a line chart. I have a slicer that allows me to filter the regions and diplay them as summed values looking like this:

Now I want to be able to display annual averages of the value column in another visual below to get the following:

I calculate the yearly average with a measure as follows:

```

YearlyAverage =

AVERAGEX(

    SUMMARIZE('pbi_example', 'pbi_example'[Start of Year]),

    AVERAGE('pbi_example'[value])

)

```

This works for a single selection as shown for the LATAM example above. However, when I select multiple regions, instead of getting an average of the sums of the values on a date per region, I just get an average for the set of regions as you can see here:

Can anyone help me out with a DAX that first sums the values per month for the selected regions, and then gets the yearly average?

Thanks a lot!

[amitchandak]

@TimHuijsmans , Try like

YearlyAverage =
AVERAGEX(
Values( 'pbi_example'[Month Year]),
calculate(Sum('pbi_example'[value]) )
)

Avg of Sum : https://youtu.be/cN8AO3_vmlY?t=22980