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| From | David Hoaglin <dchoaglin@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: difference b/w corr and pwcorr |
| Date | Wed, 10 Apr 2013 08:05:15 -0400 |
To Maarten's explanation, I would add that some analyses start with a correlation matrix and that correlation matrices have certain properties (e.g., they are nonnegative-definite or, preferably, positive-definite). You could use -pwcorr- to calculate the correlation of each pair of variables and then assemble those correlations as a matrix; but if the pairwise correlations are not based on the same sample (as -corr- would enforce), that matrix may not be a "correlation matrix." David Hoaglin On Wed, Apr 10, 2013 at 1:13 AM, Wu Zhang <wuzhang50@yahoo.com> wrote: > Right; but I do find it produces different estimates than corr does. I am confused. > > > > ----- Original Message ----- > From: Alan Acock <acock@me.com> > To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> > Cc: STATA LIST <statalist@hsphsun2.harvard.edu> > Sent: Tuesday, April 9, 2013 10:43 PM > Subject: Re: st: difference b/w corr and pwcorr > > Wu, > The pwcorr command has more options like sig for sifpgn. Tests. > > Sent from my iPad > > On Apr 9, 2013, at 2:56 PM, Wu Zhang <wuzhang50@yahoo.com> wrote: > >> Hi folks, >> >> I wanna know the difference between correlation and pairwise correlation: very confusing, for some varlist, they are the same; while different for other varlist. Could you guys help me out? >> >> Thanks, >> >> Wu >> >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/