Hello,
I'm trying to calculate Z scores by Store with a Calendar Week Slicer. If I select a single week my z scores return correctly, however, if I default to All they inflate.
Here's my formula:
Sales Units Z Score =
var Mean = CALCULATE(SUMX(Values('Calendar'[Week]),[Avg Sales Units]),ALLEXCEPT('Reports DM_STORE','Reports DM_STORE'[Store Number]))
var StandardDeviation = CALCULATE(STDEV.P('Reports FACT_SUMMARY'[SalesUnits]),ALLEXCEPT('Reports DM_STORE','Reports DM_STORE'[Store Number]))
return (SUM('Reports FACT_SUMMARY'[SalesUnits]) - Mean) / StandardDeviation
I tried altering hte STDEV.P formula to the STDEVX.P to iterate over the records, but it still returns the same Z Score when it's all said and done.
Single Week Slicer Results:
StoreNumber: 1; Sales Units Z Score: 2
All Week Slicer Results:
StoreNumber1; Sales Units Z Score: 98.64
Any idea how I can aggregate appropriately dependent on my slicer selection?
Any help would be appreciated!
Thanks,
Channing
