[R] sem package: start values

[Anthony Dick]

Thanks John--just needed to rtfm a little farther down :)

Anthony

John Fox wrote:
> Dear Anthony,
>
> From ?sem:
>
> "If given as NA, the program will compute a start value, by a slight
> modification of the method described by McDonald and Hartmann (1992). Note:
> In some circumstances, some start values are selected randomly; this might
> produce small differences in the parameter estimates when the program is
> rerun."
>
> To see exactly what's done, print out the startvalues function.
>
> Regards,
>  John
>
> ------------------------------
> John Fox, Professor
> Department of Sociology
> McMaster University
> Hamilton, Ontario, Canada
> web: socserv.mcmaster.ca/jfox
>
>
>   
>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
>>     
> On
>   
>> Behalf Of Anthony Dick
>> Sent: January-25-09 9:15 PM
>> To: r-help at r-project.org
>> Subject: [R] sem package: start values
>>
>> Hello-
>>
>> If I input a variance-covariance matrix and specify NA for start values,
>> how does sem determine the start value? Is there a default?
>>
>> Anthony
>>
>> --
>> Anthony Steven Dick, Ph.D.
>> Post-Doctoral Fellow
>> Human Neuroscience Laboratory
>> Department of Neurology
>> The University of Chicago
>> 5841 S. Maryland Ave. MC-2030
>> Chicago, IL 60637
>> Phone: (773)-834-7770
>> Email: adick at uchicago.edu
>> Web: http://home.uchicago.edu/~adick/
>>
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>>     
>
>
>   


-- 
Anthony Steven Dick, Ph.D.
Post-Doctoral Fellow
Human Neuroscience Laboratory
Department of Neurology
The University of Chicago
5841 S. Maryland Ave. MC-2030
Chicago, IL 60637
Phone: (773)-834-7770
Email: adick at uchicago.edu
Web: http://home.uchicago.edu/~adick/