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Re: st: Re: Polychoric PCA error message

From   Nick Cox <>
Subject   Re: st: Re: Polychoric PCA error message
Date   Sat, 23 Feb 2013 09:34:31 +0000

Also discussed recently: a firm expectation that you use full real names.


On Sat, Feb 23, 2013 at 5:36 AM, JVerkuilen (Gmail)
<> wrote:
> I would recommend looking at the original correlations (non
> polychoric) and one and two-way marginal tables. If there is an excess
> of zero cells or other pathological patterns, polychoric won't
> converge. Sometimes you can fix this up by judicious assumptions such
> as adding one to all cells in the table, but this needs to be handled
> with serious care. Search the archives, this was discussed recently.
> On Fri, Feb 22, 2013 at 6:50 PM, Yashin <> wrote:
>> Dear Statalisters,
>> While executing polychoric PCA to produce an asset/wealth index, three
>> iterations of the following message appeared:
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