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VAR.S Function (DAX)

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Returns the variance of a sample population.

VAR.S(<columnName>)

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])
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