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k8th
2005 Apr 27
0
Fitting a kind of Proportional Odds Modell using nlme, polr, lrm or ordgee
...(m=5)#Category
My problem is how to fit this model in R although I have a SAS code from
Whitehead which is availabe at
http://www.rdg.ac.uk/mps/mps_home/misc/publications.htm . There it is
fit by using Proc NLMIXED. The result for beta is there:
The problem is that alpha_{ik} represents the k_th intercept for the
i_th study. A "normal" Proportional-Odds model
has only alpha_k which represents the k-th intercept without any
associaton to the study.
I tried to fit it by using the functions of Pinheiro/ Bates nlme, nls,
gnls;
polr by Venables/Ripley ;
lrm by Harrell
o...