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Re: st: PCA: Principal Components as weighted sums of standardized variables (error in MV Ref. Manual?)


From   Partho Sarkar <partho.ss+lists@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: PCA: Principal Components as weighted sums of standardized variables (error in MV Ref. Manual?)
Date   Fri, 17 May 2013 18:10:06 +0530

Please ignore this post-my apologies!  I had made a mistake of my own
in  typing the formula.  With the correct formula below, the manual
and my results agree:

gen pc1try = 0.4011*std_lft500 + 0.4210*std_lft1000
+0.3664*std_lft2000+0.2809*std_lft4000+0.3433*std_rght500+0.4114*std_rght1000+0.3115*std_rght2000+0.2542*std_rght4000

Regards
Partho Sarkar

On Fri, May 17, 2013 at 5:54 PM, Partho Sarkar
<partho.ss+lists@gmail.com> wrote:
> I have just started using Stata for PCA, and am puzzled by a seeming
> error in  the Multivariate Statistics Reference Manual.
...
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