Returns the standard deviation of the entire population.
|table||Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context).|
|expression||Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context).|
A number that represents the standard deviation of the entire population.
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 function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.
The following example shows the formula for a calculated column that calculates the standard deviation of the unit price per product, when the formula is used in the Product table.
= STDEVX.P(RELATEDTABLE(InternetSales_USD), InternetSales_USD[UnitPrice_USD] – (InternetSales_USD[DiscountAmount_USD]/InternetSales_USD[OrderQuantity]))