PT autorating for multiple limits

[MagicRat]

Excuse me if this has been asked before but I'm just getting serious about using PT to help my game...

I've got more than 5000 hands at each of 3 different levels (1/2; 2/4; 3/6). Do you autorate and keep notes at just your current level of playing or do you autorate across all levels?? Would somebody's game be different enough from say 1/2 to 2/4 to give you an incorrect rating if you merged the data?? Thanks...

[captZEEbo1]

my friend keeps a seperate database for each of his different limits. I think the rules would still be roughly the same for each difficulty though.