R help - Jan 2009 - thurston case 5

Hi, I hope some one can help. I need to compute Thurston's case 5 on a large
set of data. I have gotten as far as computing the proportional preference
matrix but the next math is beyond me.

Here us my matrix

0.500	0.472	0.486	0.587	0.366	0.483	0.496	0.434
0.528	0.500	0.708	0.578	0.633	0.554	0.395	0.620
0.514	0.292	0.500	0.370	0.557	0.580	0.615	0.329
0.413	0.422	0.630	0.500	0.783	0.641	0.731	0.663
0.634	0.367	0.443	0.217	0.500	0.351	0.907	0.686
0.517	0.446	0.420	0.359	0.649	0.500	0.325	0.559
0.504	0.605	0.385	0.269	0.093	0.675	0.500	0.625
0.566	0.380	0.671	0.337	0.314	0.441	0.375	0.500

Can someone help me write an R script to compute the Thurston Case 5 values?
The result should be the scale values for each item.

I found three web pages that might be useful in this, but again, I didn't
know enough to translate them into a result.

http://marketing.byu.edu/htmlpages/books/pcmds/THURSTONE.html
http://www.personality-project.org/r/thurstone.html
http://en.wikipedia.org/wiki/Law_of_comparative_judgment

Thanks,

Jared
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Dear Jared,

See ?thurstone in the psych package. RSiteSearch("Thurstone") turns
this up
as the first hit. Also see the BradleyTerry package for the similar
Bradley-Terry model.

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 japomani
> Sent: January-31-09 5:04 PM
> To: r-help at r-project.org
> Subject: [R] thurston case 5
> 
> 
> Hi, I hope some one can help. I need to compute Thurston's case 5 on a
large
> set of data. I have gotten as far as computing the proportional preference
> matrix but the next math is beyond me.
> 
> Here us my matrix
> 
> 0.500	0.472	0.486	0.587	0.366	0.483	0.496	0.434
> 0.528	0.500	0.708	0.578	0.633	0.554	0.395	0.620
> 0.514	0.292	0.500	0.370	0.557	0.580	0.615	0.329
> 0.413	0.422	0.630	0.500	0.783	0.641	0.731	0.663
> 0.634	0.367	0.443	0.217	0.500	0.351	0.907	0.686
> 0.517	0.446	0.420	0.359	0.649	0.500	0.325	0.559
> 0.504	0.605	0.385	0.269	0.093	0.675	0.500	0.625
> 0.566	0.380	0.671	0.337	0.314	0.441	0.375	0.500
> 
> Can someone help me write an R script to compute the Thurston Case 5
values?
> The result should be the scale values for each item.
> 
> I found three web pages that might be useful in this, but again, I
didn't
> know enough to translate them into a result.
> 
> http://marketing.byu.edu/htmlpages/books/pcmds/THURSTONE.html
> http://www.personality-project.org/r/thurstone.html
> http://en.wikipedia.org/wiki/Law_of_comparative_judgment
> 
> Thanks,
> 
> Jared
> --
> View this message in context: http://www.nabble.com/thurston-case-5-
> tp21768835p21768835.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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