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Re: Correlation, significance and polynomial fitting


From: Sean O'Rourke
Subject: Re: Correlation, significance and polynomial fitting
Date: Thu, 28 Dec 2006 12:01:58 -0800
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.92 (darwin)

Joseph Wakeling <address@hidden> writes:
> First off, given a correlation provided by cor(x,y), is there a
> means of estimating the statistical significance built in to
> Octave?  Could anybody recommend a method of estimating it, if
> not?

Permutation usually works, i.e. estimate the probability that 

    abs(cor(x, y(randperm(length(y))))) >= abs(cor(x,y))

Sean


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