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How do you find your standard deviation ? It's hard for me to believe we can get a good number for that.
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Standard deviation per tournamnet in SNG poker is equal to
SQRT((F1)(p1^2)+(F2)(p2^2)+(F3)(p3^2)+(Fn)(pn^2)+( W^2))
where,
F1= probability of finishing 1st
F2= probability of finishing 2nd
F3= proabability of finishing 3rd
Fn= probability of finishing nth
(note: all OTM finishes may be combined as one probability for ease of calculation)
p1= Net profit for 1st
p2= net profit for 2nd
p3= Net profit for 3rd
pn= Net profit(loss) for nth
W= win(loss) rate in net $/tourney
Or, you can just use one of the spreadsheets out there which calculates this for you.
www.aleomagus.freeservers.com/spreadsheet
My 'confidence calculator' on this site has a pretty simple spreadsheet which will do this.
As for how 'good' these numbers are, I can't be exactly sure what you mean, but I will say that I think SD is a very reliable stat. This is mostly just because your SD will change so little so long as you are a winning player. Bigger winners will have a slightly higher SD, but almost all players will have an SD of 1.6-1.8 buy-ins (or 1,6-1,8 for those in chile).
Regards
Brad S