Huh
07-16-2003, 09:57 PM
After moving, I left the majority of my stat books at my folks house and oddly enough I can't find this on the web. I used to know how to do it...I swear....
Anyhow, could anyone give me the equation to compute standard deviation for a standard unit given variable sample sizes. Basically, I want to compute my standard deviation over several sessions each with varying length. I have been squaring/square rooting my std devs to get an idea, but I know the longer sessions should be weighted somehow...
Thanks,
-Huh
Anyhow, could anyone give me the equation to compute standard deviation for a standard unit given variable sample sizes. Basically, I want to compute my standard deviation over several sessions each with varying length. I have been squaring/square rooting my std devs to get an idea, but I know the longer sessions should be weighted somehow...
Thanks,
-Huh