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avg_if(scope, condition, expressionStr)
The function avg_if() computes the arithmetic mean of a list of the values of scope items, and returns a List-type data. Each of the items in scope (defining scope) is tested and ignored it if it fails to meet condition, otherwise items supply a value to then adding the value of each list item evaluated using the designated expressionStr. Be aware that the per-item value might be a literal value, an attribute value, or a value/string of content based on that item's expressionStr.
For a related, less focussed, operator see avg().
This computes the arithmetic mean of the value of a expressionStr in a group, as filtered by a condition expression. See avg() for a for a related non-conditional operator.
condition is action code forming a valid conditional query test, i.e. it equates to
true when matched. Some query-style operators terms may allow use of regular expressions.
expressionStr may be any valid expression, but will usually be a reference to an attribute; short form Boolean attribute expressions are acceptable.
$MyNumber = avg_if(children(/Catalog),$Price!=0,$Price);
sets $MyNumber to the average price of all the items in Catalog, ignoring any items that have a price of 0.