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


From   "Essendi H." <H.Essendi@soton.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: FW: Running Polychoric Principal Component Analysis in STATA
Date   Fri, 24 Aug 2012 19:58:11 +0000

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

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