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st: Re: polychoric


From   Stas Kolenikov <skolenik@email.unc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: polychoric
Date   Tue, 3 Feb 2004 09:53:05 -0500 (EST)

--- In statalist@yahoogroups.com, Philip Ryan <philip.ryan@a...> wrote:
> You should be cautious using -inspect- to return the number of unique
> values.  It runs out of steam after 99 distinct values and thereafter
> reports r(N_unique) as missing.  This may cause problems in your
> program.  -tabulate- (then look at r(r) ) is a better option, but it too
> has limits.
>
> Nick Cox and Gary Longton have a useful FAQ on the subject and point to
> some user-written solutions:
>
> http://www.stata.com/support/faqs/data/distinct.html

Thanks for clarification, Phil. The way I utilize the results is

if r(N_unique)>9 {

so missing is OK to me.

An overall question to the users of -polychoric-: if there are ten or more
categories, I assume the variable is continuous enough to use the moment
correlations. I can make that number an option. Is it needed to anybody
who wants the polychoric correlations of 20 categories x 20 categories?

 ---                                    Stas Kolenikov
 --       Ph.D. student in Statistics at UNC-Chapel Hill
 - http://www.komkon.org/~tacik/  -- Stas.Kolenikov@unc.edu

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