Returns the variance of a sample population.


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


Term Definition
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 that represents the variance of a sample population.


  • VARX.S evaluates expression for each row of table and returns the variance of expression; on the assumption that table refers to a sample of the population. If table represents the entire population, then you should compute the variance by using VARX.P.

  • VAR.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 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 estimates the variance of the unit price per product for a sample population, when the formula is used in the Product table.

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