My own bias is that lots of these statements
are on a level with "pink for girls and blue
for boys".
I'm not a statistician either.
Nick
[email protected]
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of
> [email protected]
> Sent: 10 December 2004 18:05
> To: [email protected]
> Subject: Re: st: RE: Factor analysis and dummy variables.
>
>
> Thanks to Nick and Mark for their inputs.
>
> Mark, the polychoric and polychoricpca are running forever.
> Is there a better way to do this?
>
> Nick,
> Unfortunatelly, he left for the weekend.
>
> But basically, in his reasonning, the PCA is reserved for continuous
> variables while the MCA is reserved for dummy variables. In the same
> idea, categorical variables (more than two responses) are to be used
> with PCA.
>
> He is a statistician, I am not. I know very few of factor
> analysis. My little
> understanding is that it creates a common factor from a dispersion in
> varlist.
>
> My problem is that I want to create an asset index.
>
> factor radio tv frige bike moto car , pcf factor(5)
> score wealthindex
>
> xtile wealthgroup5 = wealthindex, nq(5)
>
> The score I obtain after the factor is of poor quality since
> I do not have a
> homogenous
> distribution (i.e. approx 20%) of wealthgroup5 subgroups. I
> have the same
> problem with
> or without weights.
>
> Any clue what is the best solution?
>
> Many thanks.
>
>
>
>
>
>
> "Nick Cox"
>
>
> <[email protected]> To:
> <[email protected]>
>
> Sent by: cc:
>
>
> owner-statalist@hsphsun2.
> Subject: st: RE: Factor analysis and dummy variables.
>
> harvard.edu
>
>
>
>
>
>
>
>
> 12/10/2004 12:42 PM
>
>
> Please respond to
>
>
> statalist
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> What did your colleague say was the
> reason for it being "wrong"? What
> are your criteria for recognising
> a "best command"?
>
> Nick
> [email protected]
>
> [email protected]
>
> > I know this question has been asked several times, but it's
> > worth asking again.
> >
> > Is it right to perform PCA analysis with dummy (0/1) variables?
> >
> > I used to code :
> >
> > factor radio tv frige bike moto car , pcf factor(5)
> >
> > where radio tv ... are dummy (0/1),
> >
> > but a colleague just told me I am wrong.
> >
> > A MCA in his mind is better.
> >
> > What is the best command in that case? Just to make sure.
> >
>
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