[Jacob_Gilliam]

Pokertracker does it for you. If you dont have pokertracker, you need to know how much your going up or down per 100 hands. So for a sample of 10000 hands you have 100 results. For each sample record how far off the average you are (in one cycle you made 17bb- 15 off average, in the next cycle you lost 9- -11bb off average etc). Take all those results and square them individually (dont add them all together and then square them). Now add them all together, divide by the number of samples ( in this example 100), and take the square root of that number. The final number is your standard of deviation.