# WtAvg

## Description

Computes the weighted average value of an aggregation of values and weights.

## Syntax

WtAvg ( n, w )

## Arguments

`n` is a numeric expression indicating the values to average, and

`w` is a numeric expression indicating the weight to apply to `n`.

## Remarks

WtAvg is an aggregation function which can only be used in an aggregating `Select` statement. Null values for `n` and/or `w` are ignored. If there are only null values supplied in the aggregation, then a null value is returned. If the denominator results in a value of zero (which would occur if the weights are zero for each record accumulated), then a value of null will be returned.

WtAvg can be replaced with the following formula: Sum ( n * w ) / Sum ( w )