A relative reference in @if statements.
True—if the period is in quarters
False—if not
If 2007 is in years and 2008 is in quarters, this formula:
@if(@isqtr, 1, 2)
returns 2 in 2007, and a 1 for each quarter in 2008.
If this function was built using Using User-Defined Accounts, the 2008 year end aggregate period returns a 2.