Tutorial with example
In this series of statistical functions we are looking at the standard deviation:
Download example file:
Download Power BI file: here.
- 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.
- 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
- Blank rows are filtered out from columnName and not considered in the calculations.
- 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.