avg( )

Refines a WixDataAggregate to only contain the average value from each aggregation group.

The avg() function refines a WixDataAggregate to contain the average value from the specified property for each aggregated group or from the whole collection if no group is defined.

When the aggregation is run, the returned WixDataAggregateResult object contains an item for each group with the following key:value pairs:

• If a value was passed for the optional projectedName, the key is named using that value. Otherwise, the key is named using the following format: "propertyNameAvg", where propertyName is the name of the specified property.
• The value is the average of the values found in the specified property.

Averages can only be calculated on properties of type Number.