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Applies to: 
Calculated column
Calculated table
Measure
Visual calculation
Returns the standard deviation of the entire population.
Syntax
STDEV.P()
Parameters
| Term | Definition |
|---|---|
columnName |
The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. |
Return value
A number representing the standard deviation of the entire population.
Remarks
STDEV.P assumes that the column refers to the entire population. If your data represents a sample of the population, then compute the standard deviation by using STDEV.S.
STDEV.P uses the following formula:
√[∑(x - x̃)2/n]
where x̃ is the average value of x for the entire population and n is the population size.
Blank rows are filtered out from
columnNameand not considered in the calculations.An error is returned if
columnNamecontains less than 2 non-blank rows-
This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.
Example
The following example shows the formula for a measure that calculates the standard deviation of the column, SalesAmount_USD, when the table InternetSales_USD is the entire population.
= STDEV.P(InternetSales_USD[SalesAmount_USD])