On Jul 17, 2015, at 4:33 PM, varin sacha wrote:
> Dear R-Experts,
>
> I have fitted an ordinal logistic regression with just 1 explanatory variable
> for the reproducible example here below.
>
> Everything is working, now I try to calculate the Nagelkerke Pseudo
> R-squared.
> I have found a package BaylorEdPsych providing many Pseudo R-squared, but the
> example shown in the package is for GLM (binary logistic regression) not for
> ordinal logistic regression.
> How can I calculate the Nagelkerke Pseudo R-squared for ordinal logistic
> regression ?
polr-objects have a deviance node. If this has statistical value (which I have
some doubts regarding) then just apply the usual formula to compare nested
models.
--
David.
>
> Many thanks as usual for your precious help.
>
> Reproducible example :
>
> install.packages("MASS")
> library(MASS)
> a=factor(c("tres grand", "grand", "petit","petit","tres
> grand","grand","petit","petit","tres grand","grand"))
> b=c("homme", "homme", "femme", "femme", "femme", "homme", "homme", "homme",
> "femme", "femme")
> m <- polr(a ~ b, Hess=TRUE)
> summary(m)
>
> ______________________________________________
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David Winsemius
Alameda, CA, USA
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