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[QUOTE="dmorris68, post: 2016475, member: 40397"]
AF is common but for aforementioned reasons, it's not an entirely accurate measure of aggression.  AF of less than 2 indicates a very passive player who should be very easy to exploit.  Solid players are usually in the 3-4 range, and really tough aggro players can run higher.  Of course you need a decent sample size for these to be entirely meaningful -- over a few dozen hands it's not uncommon to see double-digits here when even non-aggressive players run good.

Aggression Frequency (AFq or AF%) is becoming a more popular measure.  It's calculated as [b](raises+bets) / (raises+bets+calls+folds)[/b], which takes more passive action (+folds) into account.  Checks aren't counted but really don't need to be, because unless hands go check-check all the way to showdown -- and most won't -- some other aggressive or passive action must follow a check and will thus be represented.  Good aggressive players will typically have AFq's of around 25-40%, give or take.

Both are postflop aggression stats.  Preflop aggression is determined from other stats, namely PFR in relation to VPIP, along with 3+bet tendencies.  Some are promoting RFI (Raise First In) as a replacement for PFR, since recent changes to both PT and HM PFR stats ignore hands entirely where you don't have a chance to PFR, and thus can skew the numbers.  Especially over smaller sample sizes.
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