Tutorial with example
In this series of statistical functions we are looking at the standard deviation:
Download example file:
Download Power BI file: here.
- STDEV.S assumes that the column refers to a sample of the population. If your data represents the entire population, then compute the standard deviation by using STDEV.P.
- STDEV.S uses the following formula:
√[∑(x – x̃)²/(n-1)]
where x̃ is the average value of x for the sample 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.