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Function Reference

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VARIANCE

Returns the variance of a value you pass to it. VARIANCE is used to analyze statistical data.

You can nest only one other aggregate function within VARIANCE, and the nested function must return a numeric data type.

You cannot nest aggregate functions in advanced mode.

Use only in

mapping

tasks.

Syntax

VARIANCE( numeric_value [, filter_condition ] )

Argument	Required/ Optional	Description
numeric_value	Required	Numeric data type. Passes the values for which you want to calculate a variance. You can enter any valid transformation expression.
filter_condition	Optional	Limits the rows in the search. The filter condition must be a numeric value or evaluate to TRUE, FALSE, or NULL. You can enter any valid transformation expression.

Formula

The function uses the following formula to calculate the variance:

Use the following guidelines for this formula:

xi
is one of the numeric values.

n
is the number of elements in the set of numeric values. If n is 1, the variance is 0.

Return Value

Double value.

NULL if all values passed to the function are NULL or if no rows are selected (for example, the filter_condition
evaluates to FALSE or NULL for all rows).

Nulls

If a single value is NULL, VARIANCE ignores it. However, if all values passed to the function are NULL or if no rows are selected, VARIANCE returns NULL.