PFR
Pre-Flop Raise — % of hands where a player raises preflop
Definition
PFR (Pre-Flop Raise) is the percentage of hands where a player raises preflop: open raise, 3-bet or 4-bet. It's the indicator of a player's preflop aggression. The VPIP/PFR ratio is very revealing of playing style. A PFR close to the VPIP means the player raises almost every hand they play: aggressive TAG profile. A PFR well below the VPIP means the player often calls without initiating aggression: passive profile (fish or calling station). In 6-max Cash Game, a PFR of 18–22% with a VPIP of 22–26% corresponds to a good TAG. A very low PFR (5–8%) with a VPIP of 25%+ indicates a player who calls too much and raises too little — a tendency easily exploited by increasing your c-bet and barrel frequency.
VPIP 25 / PFR 20: an aggressive player who almost always raises. VPIP 30 / PFR 10: a passive player who calls too much — widen your value bets and cut your bluffs (he calls too much for a bluff to profit), and respect his resistance: when a player this passive starts raising, he almost always has a real hand.