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Re: st: RE: FW: Running Polychoric Principal Component Analysis in STATA
From
Stas Kolenikov <[email protected]>
To
[email protected]
Subject
Re: st: RE: FW: Running Polychoric Principal Component Analysis in STATA
Date
Sun, 26 Aug 2012 17:15:17 -0500
Hildah,
-poychoricpca- has option -score-, as the help file explains. It
produces the principal components.
On Fri, Aug 24, 2012 at 2:58 PM, Essendi H. <[email protected]> wrote:
> Hi,
>
> I have run my Polychoric PCA with 30 variables and these are my results. How do I extract the principal components?
>
>
>
> k Eigenvalues Proportion explained Cum. explained
>
> 1 9.875133 0.329171 0.329171
> 2 3.914605 0.130487 0.459658
> 3 2.199687 0.073323 0.532981
> 4 1.972968 0.065766 0.598746
> 5 1.806116 0.060204 0.658950
> 6 1.491586 0.049720 0.708670
> 7 1.057610 0.035254 0.743924
> 8 0.957563 0.031919 0.775842
> 9 0.876737 0.029225 0.805067
> 10 0.808630 0.026954 0.832021
> 11 0.721940 0.024065 0.856086
> 12 0.617829 0.020594 0.876680
> 13 0.568042 0.018935 0.895615
> 14 0.534358 0.017812 0.913427
> 15 0.474645 0.015821 0.929248
> 16 0.432420 0.014414 0.943662
> 17 0.394679 0.013156 0.956818
> 18 0.350109 0.011670 0.968489
> 19 0.317694 0.010590 0.979078
> 20 0.272341 0.009078 0.988156
> 21 0.266147 0.008872 0.997028
> 22 0.228569 0.007619 1.004647
> 23 0.182232 0.006074 1.010721
> 24 0.134601 0.004487 1.015208
> 25 0.073532 0.002451 1.017659
> 26 0.002814 0.000094 1.017753
> 27 0.000000 0.000000 1.017753
> 28 -0.000000 -0.000000 1.017753
> 29 -0.009973 -0.000332 1.017420
> 30 -0.522612 -0.017420 1.000000
>
>
>
> scalars:
> r(lambda30) = -.5226117872285307
> r(lambda29) = -.0099733429209876
> r(lambda28) = -2.91788802401e-11
> r(lambda27) = 2.91791708536e-11
> r(lambda26) = .0028136759119166
> r(lambda25) = .0735315467859793
> r(lambda24) = .1346013978294836
> r(lambda23) = .1822315003459927
> r(lambda22) = .228568953051127
> r(lambda21) = .2661472213481918
> r(lambda20) = .2723408357592857
> r(lambda19) = .3176943611403527
> r(lambda18) = .3501089523760873
> r(lambda17) = .3946787848401978
> r(lambda16) = .432420025218819
> r(lambda15) = .4746446780762609
> r(lambda14) = .5343577888749866
> r(lambda13) = .5680416974993906
> r(lambda12) = .6178288336363039
> r(lambda11) = .7219402529310105
> r(lambda10) = .8086298902211778
> r(lambda9) = .8767365013048373
> r(lambda8) = .9575625979499038
> r(lambda7) = 1.05760970715606
> r(lambda6) = 1.491586326478875
> r(lambda5) = 1.806116092435452
> r(lambda4) = 1.972968399660107
> r(lambda3) = 2.19968656497797
> r(lambda2) = 3.914605324771372
> r(lambda1) = 9.87513321956839
>
> Thanks,
> HIldah
>
>
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of Essendi H.
> Sent: 22 August 2012 15:00
> To: [email protected]
> Subject: st: FW: Running Polychoric Principal Component Analysis in STATA
>
> Dear STATA,
>
> 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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> * http://www.ats.ucla.edu/stat/stata/
>
> *
> * For searches and help try:
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> * http://www.ats.ucla.edu/stat/stata/
--
-- Stas Kolenikov :: http://stas.kolenikov.name
-- Senior Survey Statistician, Abt SRBI :: work email kolenikovs at
srbi dot com
-- Opinions stated in this email are mine only, and do not reflect the
position of my employer
*
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* http://www.stata.com/support/statalist/faq
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