[R] sem (lisrel) - starting problems

John Fox jfox at mcmaster.ca
Wed Oct 9 13:43:03 CEST 2002

Dear Christian,

At 07:57 AM 10/9/2002 +0200, chr.schulz at email.de wrote:
>hello john,
>(1) Do you intend nemploy and sales to be indicators of compcar? If so, 
>the arrows are going in the wrong direction.
>..yes, is lamx1 etc. correct for this part  and lamy1 etc. for the latent 
>y-variable ?

I'm not sure that I follow. You can make up whatever parameter names you 
want, so certainly you can use lamx1 and lamy1. Note that  if two 
parameters have the same name then that implies an equality constraint; 
different names -- as here -- imply different parameters.

>(2) A similar comment applies to sex and age as indicators of personcar, 
>but it's hard to imagine that such a specification would make sense.
>.....this is first  an easy example with my data , but why you think it is 
>nonsense that age and sexual status are indicators for a latent variable 
>(...of course the scale's should be approriate ?)

I can't really tell without knowing what the variables are, but I usually 
think of something named "age" or "sex" as exogenous.

I hope that this helps,
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox

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