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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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