fe45a3b1_lian_Broadcasting_Corporation___Definition
[Term] Parameter variations [Definition] 
Parameter variations refer to the budget’s assumptions about the economy (such as growth, inflation and unemployment) and how these will affect revenue and costs. The parameter variations in the MYEFO were vastly different to those set out in the PEFO, leading commentators to question whether they were massaged to provide a worst-case scenario, giving the Government more freedom to implement unpopular cuts and space for a miraculous recovery in the upcoming budget.
Budget 2014: Tony Abbott opens door to 'horse-trading' with minor parties in Senate to pass key measures - Federal Budget 2014 - ABC News (Australian Broadcasting Corporation)
Definition