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st: difference between "Spearman" and "pwcorr / correlate"


From   Ashwin Ananthakrishnan <ashwinna@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: difference between "Spearman" and "pwcorr / correlate"
Date   Tue, 6 Oct 2009 17:31:52 -0700 (PDT)

Hi, 

In examining the correlation between two variables, what is the difference in utility of the Spearman correlation co-efficient (stata command 'spearman') and the Pearson correlation co-efficient (stata command "pwcorr" or "correlate")?

Is there a situation where one is more applicable than the other? What does it mean if the correlation is significant with one but not the other?

Thanks, 

Ashwin


      
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