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STDEVX.S

  • Стаття

Applies to: Calculated column Calculated table Measure Visual calculation

Returns the standard deviation of a sample population.

Syntax

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

Parameters

Term Definition
table Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context).
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 standard deviation of a sample population.

Exceptions

Remarks

  • STDEVX.S evaluates expression for each row of table and returns the standard deviation of expression assuming that table refers to a sample of the population. If table represents the entire population, then compute the standard deviation by using STDEVX.P.

  • STDEVX.S uses the following formula:

    √[∑(x - x̃)2/(n-1)]

    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 function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

Example

The following example shows the formula for a calculated column that estimates the standard deviation of the unit price per product for a sample population, when the formula is used in the Product table.

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