Say if i was backtesting using:

Quote:
BarPeriod = 15;


But then adjusted this to:

Quote:
BarPeriod =12;
BarOffset = 3;


Why do my backtesting results differ?

I would have though the second version amounts to a BarPeriod of 15 also and so the backtesting results should be exactly the same as each other?

Or am I not understanding this correctly?