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-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On
> Behalf Of japomani
> Sent: January-31-09 5:04 PM
> To: r-help@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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