[R] Can Package SEM do mean structural analysis?
Mitsuo Igarashi
mitsu5 at ruby.famille.ne.jp
Sun May 25 07:03:42 CEST 2003
Dear John:
Thank you very much for your prompt explanation on the
present possibilities of SEM.
I am not a statistician so that I can not figure out the raw sums-of-squares-and-products matrix.
And I will do with SEM in the area without mean structural
equation.
I appreciate your good teaching at every time.
--------========----------
Mitsuo Igarashi
mitsu5 at ruby.famille.ne.jp
----------------
John Fox <jfox at mcmaster.ca> wrote:
> Dear Mitsuo,
>
> My intention in writing the sem package was to provide a basic
> structural-equation facility for R. I haven't made explicit provision for
> models with means, but it might be possible to fit such models by using the
> raw sums-of-squares-and-products matrix among the observed variables
> (perhaps divided by n) as input. It might be necessary to make small
> modifications to degrees of freedom, etc.
>
> I'm afraid that I don't have time now to figure out whether this will work
> and, if so, precisely how to do it, but you're welcome to try. If you get
> it to work, I'd be interested in the answer. If this approach doesn't work,
> then incorporating means would likely require major modifications to the
> program.
>
> There are, by the way, several other things that dedicated
> structural-equation software does that the sem package does not -- e.g.,
> analysis by groups and for ordinal observed variables. I may, at some
> point, extend the package in these directions, but I don't have plans at
> the moment to do so.
>
> Good luck,
> John
>
> At 10:53 PM 5/24/2003 +0900, you wrote:
>
> >I am wondering whether Package SEM can do with intercepts and
> >means in its structural analysis.
> >
> >If it can not calculate, how can I make a supplemental function
> >in R?
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