Re: NL Variance
1 PTBB equals 2 big blinds. A standard deviation of 45 PTBB/100 would be 90 big blinds/100. There is no reason to use PTBB except that it is what PokerTracker uses, and PokerTracker is the most convenient way to get the data.
The swings in NL are smaller in comparison with the win rate of a winning player, but they are larger in comparison with the big blind. If you play $5-$10 limit, you may have a win rate of $20/100 (2 BB/100) with a standard deviation of $150/100. If you play NL 100, with a $1 big blind, you may have a win rate of $20/100 (10 PTBB/100) with a standard deviation of $80/100. The bankroll needed to win $20/100 is smaller for NL at the same level of safety.
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