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DAX Statistical - STDEVX.P function
Description
Evaluates the given expression for each row of the given table and returns the standard deviation of expression assuming that the table refers to the entire population.
Syntax
STDEVX.P (<table>, <expression>)
Parameters
| Sr.No. | Parameter & Description |
|---|---|
| 1 |
table A table or any DAX expression that returns a table of data. |
| 2 |
expression Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). |
Return Value
A real number.
Remarks
DAX STDEVX.P function evaluates an expression for each row of table and returns the standard deviation of an expression assuming that the table refers to the entire population. If the data in the table represents a sample of the population, you should use DAX STDEVX.S function instead.
STDEVX.P uses the following formula −
$$\sqrt{\sum\frac{(x\:-\:\bar{x})^{2}}{N}}$$
Where, $\bar{x}$ 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 calculation.
An error is returned if columnName contains less than 2 non-blank rows.
Example
= STDEVX.P (Sales,[Sales Amount])