R help - Feb 2006 - elements from 'sem' function

Hi, 
I would like to print elements from sem (structural equation modeling) 
function (e.g., model-reproduced covariance matrix (C); estimated asymptotic 
covariance matrix of parameter estimates (cov)). 

How can I  do this? 

Thanks, 
Andr?? 

--
Andr?? Tavares Corr??a Dias
Laborat??rio de Ecologia Vegetal
Universidade Federal do Rio de Janeiro
CCS-IB-Departamento de Ecologia
Caixa Postal 68020
21941-970 Rio de Janeiro ? RJ, Brazil
tel: +55 21 25626377
Fax: + 55 21 25626320
atcdias at biologia.ufrj.br

Dear Andr??,

The components of the "sem" object returned by sem() are explained on
the
help page ?sem. There are several methods for "sem" objects:
> methods(class="sem")
[1] mod.indices.sem*            normalized.residuals.sem*  
[3] path.diagram.sem*           print.sem*                 
[5] residuals.sem*              standardized.residuals.sem*
[7] summary.sem*  

To retrieve components of the object directly, just use, e.g., object$C (for
the reproduced covariance matrix), or object$coeff (for estimates of free
parameters), in the normal manner for indexing a list. It would probably be
better for me to provide accessor functions [e.g., for the coef() generic]
for at least some of these, so I'll put that on the list of things to do.

I hope this helps,
 John 

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of andre 
> tavares correa dias
> Sent: Tuesday, February 07, 2006 12:28 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] elements from 'sem' function
> 
> Hi,
> I would like to print elements from sem (structural equation 
> modeling) function (e.g., model-reproduced covariance matrix 
> (C); estimated asymptotic covariance matrix of parameter 
> estimates (cov)). 
> 
> How can I  do this? 
> 
> Thanks,
> Andr?? 
> 
> --
> Andr?? Tavares Corr??a Dias
> Laborat??rio de Ecologia Vegetal
> Universidade Federal do Rio de Janeiro
> CCS-IB-Departamento de Ecologia
> Caixa Postal 68020
> 21941-970 Rio de Janeiro ? RJ, Brazil
> tel: +55 21 25626377
> Fax: + 55 21 25626320
> atcdias at biologia.ufrj.br
> 
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