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From | "Essendi H." <H.Essendi@soton.ac.uk> |
To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
Subject | RE: st: RE: FW: Running Polychoric Principal Component Analysis in STATA |
Date | Wed, 29 Aug 2012 14:39:47 +0000 |
Hi Stas, I have managed to do it-many thanks. Hildah -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Stas Kolenikov Sent: 26 August 2012 23:15 To: statalist@hsphsun2.harvard.edu Subject: Re: st: RE: FW: Running Polychoric Principal Component Analysis in STATA 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. <H.Essendi@soton.ac.uk> 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: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Essendi H. > Sent: 22 August 2012 15:00 > To: statalist@hsphsun2.harvard.edu > 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 > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * 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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/