Standard Deviation

[Zito]

How do I find/add my standard deviation to the results window in the statistics tab?

[WhiteRider]

Right click the report you're interested in and choose Configure Report. If you type "dev" into the search window you'll see the standard deviation stats which are available.

[Zito]

Does "StdDev(BB)"= standard deviation in BB/100, if not how would I find/calculate this?

[kraada]

It's standard deviation in big blinds per hand. To get standard deviation in big blinds per 100 hands, multiply the value you get by 10.

The mathematical explanation for multiplying by 10 goes like this:

You want the standard deviation over a sample of 100 hands and we have it over 1 hand now. Variance for independent events are additive, therefore we can square the standard deviation to get the variance per hand. We can add up the variance for 100 hands, then take the square root to get the standard deviation per 100 hands. This works out to be:

sqrt(100 * SD^2), or 10 * sqrt(SD^2) or 10 * SD.

[Zito]

When I look at my average STD(BB) I get 397.85 (154k hands) 3978.5, seems like a huge STD, admittedly given the little I now about STD.

I'm trying to find my bb/100 STD to plug into:
http://www.evplusplus.com/poker_tools/v ... simulator/

[kraada]

That definitely does sound large. Do you have any filters enabled? If it was filtered to hands where you 3bet or some such that would make the standard deviation a whole heck of a lot higher.

[pt4pt4pt4]

Any more info on this stat and its use with PT4?

[tocsey]

Hi,

I played
- 4749 hands on NL10
- 26602 hands on NL5
- 26219 hands on NL2

and the StDev(BB) is 0 for all except for NL2 where it is 71263.50.

I didn't use any filters.

Thanks!

[tocsey]

I've noticed something:

I filtered just for yesterday:

- 3452 hands on NL10

and the StdDev(BB) is 74.10.

[kraada]

This stat is calculated as the standard deviation of win in big blinds per hand - it uses the built in standard deviation function in PostgreSQL. As stated earlier to turn in into standard deviation in bb/100, multiply by 10.

I'm now remembering a conversation I had with a development team member recently that this stat is being added to our cache and should not be. The easiest way to disable the cache in a report is to add the "Sessions" stat to the report.