# VAR.P Function (DAX)

Returns the variance of the entire population.

VAR.P(<columnName>)

#### Parameters

columnName

The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression.

A number with the variance of the entire population.

VAR.P assumes that the column refers the entire population. If your data represents a sample of the population, then compute the variance by using VAR.S.

VAR.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 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 http://go.microsoft.com/fwlink/?LinkId=219171.

The following example shows the formula for a measure that estimates the variance of the SalesAmount_USD column from the InternetSales_USD table, for the entire population.

=VAR.P(InternetSales_USD[SalesAmount_USD])