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Re: standard deviation accuracy question

by Anonymous Monk
on Jul 22, 2005 at 15:18 UTC ( [id://477252]=note: print w/replies, xml ) Need Help??


in reply to standard deviation accuracy question

does anyone know why i might be getting different results to these commercially available applications?
Are you suffering from numerical round-off problems? How many elements are in the array? How big are the individual elements compared to $sum and $sumsq? One way to test for numerical errors is to plot a graph of the standard deviation for various numbers of $elements. If the graph looks like it converges to a value, you're OK, but if the answer plot starts to "get fuzzy" (i.e. more random) you probably have problems.

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