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Re: standard deviation accuracy question

by Anonymous Monk
on Jul 22, 2005 at 14:54 UTC ( [id://477244]=note: print w/replies, xml ) Need Help??


in reply to standard deviation accuracy question

ok i am trying to compute the sample standard deviation and i am comparing to excels STDEV function (which divides by N - 1 giving the samples standard deviation) my values aren't masssivly different from those given by excel but enough to be worrying i believe the algorithm is right i'm just supprised if a precision difference could cauze the differences i'm seeing i'll post the data in a sec probably getting round the broken ppm is the answer there are so many other things i need to install modules for anyway but i got used to writing my own bits for portability around this crazy network

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Re^2: standard deviation accuracy question
by jpeg (Chaplain) on Jul 22, 2005 at 15:44 UTC
    the formula you're using in the original post divides by N. Of course you'll be getting different results.
    --
    jpg

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