>>How can he say that Spearman's rank order correlation given by
>>rho = 1 - [6sigmaD^2]/[N(N^2-1)]
>>is just Pearson's product moment correlation given by
>>r =[NsigmaXY -(sigmaX)(sigmaY)]/SQRT{[NsigmaX^2-(sigmaX)^2][
NsigmaY^2-(sigmaY)^2]}
>>using ranks instead of scores?
It can be said without any difficulty, because it is!
Paul Jackson
London School of Economics
.
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