VAR.S Function (DAX)

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 a sample population.

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

2. 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

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

The following example shows the formula for a measure that calculates the variance of the SalesAmount_USD column from the InternetSales_USD for a sample population.

=VAR.S(InternetSales_USD[SalesAmount_USD])