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In my recent quest to create or catalog as many DAX equivalents for Excel functions, this was another walk in the park:
DEVSQ =
VAR __Mean = AVERAGE('Table'[Column1])
VAR __Table =
ADDCOLUMNS(
'Table',
"Deviation",POWER([Column1] - __Mean,2)
)
RETURN
SUMX(__Table,[Deviation])
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