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Re: st: FW: Running Polychoric Principal Component Analysis in STATA

From   Nick Cox <>
Subject   Re: st: FW: Running Polychoric Principal Component Analysis in STATA
Date   Wed, 22 Aug 2012 15:22:28 +0100

-polychoric- is not on SSC. It's on Stas's Missouri website.

On Wed, Aug 22, 2012 at 3:18 PM, Abekah Nkrumah <> wrote:
> Dear Hilda,
> I have used the polychoric PCA command by Stas you can download it
> from SSC and it has an adequate help file which you can read. As far
> as I know you do not need to recode the data into dummies (see the
> paper publish by Stas Kolenikov and Angels in the Journal of Income
> and Wealth). It should be possible for you to go ahead and run the PCA
> with the variables on an ordinal scale. Hope this helps

On Wed, Aug 22, 2012 at 2:59 PM, Essendi H. <> wrote:

>> How can I run Polychoric principal component analysis in STATA? . I have likert scale data on wellbeing and I would like to prepare wealth quintiles based on these subjective responses. The challenge I am facing however is how to prepar e my variables before running this. I am not sure whether I need to recode them into dummy variables or just rung these with all the ordered category?.  Also kindly advice on how to do this step by step.
>> Many thanks,
>> Hildah

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