Time Link to 00:49:20
Just a small correction re. the discussion on AF at this spot
-Aggression FACTOR is actually calculated by (# of bets + # of raises) / # of calls. In other words, neither folding NOR checking effect the stat. Since it's a ratio, betting and raising increase it, while calling decreases it.
-Aggression frequency, on the other hand, is the comparison of aggressive actions made (bets/raises) to passive actions (calls/checks), represented as a percentage of the aggressive actions overall. Folding does not directly influence either of the stats, though RE is correct that players who make better folds rather than loose calls will indeed have HIGHER aggression factors.
As an example, if on the first hand at a table, you bet the flop, bet the turn, then check/fold the river, your aggression frequency is 66% (2 aggro: 1 passive). Your AF would not take the check into account, and thus would be infinite (as you can't divide by 0).
However, if you bet the flop, bet the turn, and check/CALL the river, your aggression frequency changes to 2 (2bets/1 call) while your agg frequency becomes 50% (2 aggressive actions over 4 total actions).
Here's the source for this:
http://faq.holdemmanager.com/questions/95/Stat+Definitions#answer
It's important to note that bets and raises are treated as equal to one another by both stats, so a relatively "aggressive" opponent could be someone who raises a lot AND/OR bets a lot.
If you don't mention it later in the vid, it's also important for people to recognize that the Aggr. factor stat turns out to be a function of VPIP, in that a tighter player will typically have a higher agg factor than a looser player simply because he is tight. As a result, when you have a loose player and a tight player who have the same A. factor, the LOOSER player is actually playing MORE AGGRESSIVELY. You can't simply compare players aggression factors to each other to determine who is more aggressive-you must factor in their relative VPIP's.
Aggression FREQUENCY changes independently of VPIP, however, so a loose and tight player with identical aggression frequencies are making the identical PERCENTAGE of aggressive actions overall.