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daodb
2007 Nov 10
1
polr() error message wrt optim() and vmmin
...e variable is ordinal and factored, and the independant variable
is continuous. I've checked the source code for both polr() and optim()
and can't find any variable called "vmmin" as referenced in the error
message.
Any suggestions welcome.
Thanks,
Anders
> summary(data$ordaodb)
0 1 2 3 4
8228 3505 1755 559 1757
> summary(data$gpconc)
Min. 1st Qu. Median Mean 3rd Qu. Max.
0.138 0.280 0.313 0.305 0.332 0.515
> formula<-data$ordaodb~data$gpconc
> propensityordaodb.plr <- polr(formula, method="cauchit")
> p...