STDEVX.S

Syntax

STDEVX.S(<ColumnName>)

Tutorial with example

In this series of statistical functions we are looking at the standard deviation:

Download example file:

Download Power BI file: here.

Remarks

1. STDEVX.P evaluates expression for each row of table and returns the standard deviation of expression assuming that table refers to the entire population. If the data in table represents a sample of the population, you should compute the standard deviation by using STDEVX.S instead.
2. STDEVX.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.