[R] thurston case 5

John Fox jfox at mcmaster.ca
Sun Feb 1 12:27:43 CET 2009


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
> --
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> 
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