Passive play theory vol.1

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The point of knowing these statistics for your opponent is to help you put him on a hand range and react accordingly.

If 2 players have the same AF, the player with the higher VPIP is doing more postflop betting and raising, so you put him on a wider range of hands when he bets.

Everyone was looking at the guy's 0.4 AF and figuring he must have a monster. My point is just that with a 50% VPIP, his aggression doesn't mean as much as a 25% VPIP with 0.4AF.

I also suggest that maybe you could put him on a similar range of hands as someone with a 25% VPIP and 0.8 AF. I don't think its an exact comparison, but worth thinking about.