--- Timura, Catherine A wrote:
> I am using stata 10 for mac. I want to do a principal component
> analysis over a correlation table (and not have the program do an
> additional correlation over the data). While the option exists in
> the menu, it does not allow the diagonal to be blank. Please advise
> on how to allow for the diagonal to remain blank, to avoid having it
> part of the analysis. We are doing cultural consensus analysis over
> hand-drawn agreement tables, as correlations underestimate agreement
> between individuals.
You can fill the diagonal, because you know that a variable is always
perfectly correlated with itself. So the elements on the diagonal of
the correlation matrix are always 1.
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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