Poker Tracker standard deviation

[jobro2]

If your standard deviations on Poker Tracker are listed:

SD/HR $7.28---14.46

SD/100 $8.09---16.1

Does that mean that for any given session that 68% of the time your SD/HR and your SD/100 will lie between the two numbers provided?

[Siegmund]

No.

That means that your overall standard deviation so far has been $8.09 per hundred or 16.1 big bets per hundred (apparently your stats are taken only from 25/50c tables?)

For any one given session, you have to consider the session length. If you play a session of some large number of hands N, your net for the session should be within 16.1*Sqrt(N/100) big bets of your hourly rate 68% of the time.

Notice that it takes quite a large N for this average to start behaving like it is normally distributed.

[jobro2]

Thanks for your answer. So the first number is in dollars and the second number is in BB's. I thought they were both in dollars.

[jobro2]

How do you know the results are only from .25/.50 tables?

[maldini]

not that i know what to do with this stat...but where is it in PT? i cant find it on any screen. (probably assume its talking about showdowns).
thanks

[jobro2]

go to the session notes tab and click on the details tab (in the upper right hand area of the screen)

[bobbyi]

[ QUOTE ]

Does that mean that for any given session that 68% of the time your SD/HR and your SD/100 will lie between the two numbers provided?

[/ QUOTE ]
It means that for a given hour, you will be within that SD/hr range 68% of the time and for a given 100 hands, you will be within that SD/100 hands 68% of the time. As someone else noted, it doesn't work that way for a whole session because the length of the session matters. As the session gets longer, the chance that you are close to your expectation will increase. Imagine if you played a trillion hour long session. Do you really think that a third of the time your BB/100 for the session will be more than your SD/100 away from the mean?