A relative time reference in @if statements.
True—if the period is a year or yearend
False—if not
If 2007 is in years and 2008 is in quarters, this formula:
@if(@isyear, 1, 2)
returns 1 in 2007, and 2 for each quarter in 2008.
If this function was built using Using User-Defined Accounts with the None option, the 2008 year-end aggregate period returns 1.