VARX.P Function (DAX)

  • Article

Returns the variance of the entire population.

Syntax

VARX.P(<table>, <expression>)

Parameters

  • table
    Any DAX expression that returns a table of data.

  • 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 number with the variance of the entire population.

Remarks

  1. VARX.P evaluates <expression> for each row of <table> and returns the variance of <expression> assuming that <table> refers to the entire population.. If <table> represents a sample of the population, then compute the variance by using VARX.S.

  2. VARX.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. For more information about semantic differences in DirectQuery mode, see  https://go.microsoft.com/fwlink/?LinkId=219171.

Example

The following example shows the formula for a calculated column that calculates the variance of the unit price per product, when the formula is used in the Product table

=VARX.P(InternetSales_USD, InternetSales_USD[UnitPrice_USD] –(InternetSales_USD[DiscountAmount_USD]/InternetSales_USD[OrderQuantity]))