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Operator Type: 

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 Function   [other Function type actions]

 Conditional Group   [operators of similar scope]

 Mathematical   [other Mathematical operators]




This computes the arithmetic mean of a value in a group, as filtered by a condition expression. See avg() for a for a related non-conditional operator.

group describes the notes to be examined and may be any of {children,descendants,siblings,ancestors,all}.

condition is a valid conditional test - i.e. it equates to true when matched.

value may be any valid expression, but will usually be a reference to an attribute; short form Boolean attribute expressions are acceptable.

For example:


returns the average price of all the items in Catalog, ignoring any items that have a price of 0.

A Tinderbox Reference File : Actions & Rules : Operators : Full Operator List : avg_if(group,condition,value)