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STDEV.P Function (DAX)

SQL Server 2012

Returns the standard deviation of the entire population.

STDEV.P(<ColumnName>)
columnName

The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression.

A number representing the standard deviation of the entire population.

  1. 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.

  2. 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

  3. Blank rows are filtered out from columnName and not considered in the calculations.

  4. An error is returned if columnName contains less than 2 non-blank rows

This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see  http://go.microsoft.com/fwlink/?LinkId=219171.

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])
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