On Sun, Feb 24, 2013 at 8:46 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> My guess is that Jay meant Pearson correlations as calculated by -correlate-.
Yes, that's right. Polychorics are nice in theory but they're unstable
for many reasons already discussed. An ordinary Pearson correlation
will often tell you quite a bit. So for instance, if one is massive
and the rest are quite a bit smaller, you will almost certainly have
issues. Also look at the two way tables. You can usually predict
problems that way.
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