[R] Problem with ordered logistic regression using polr function

From: Debarchana Ghosh <ghos0033_at_umn.edu>
Date: Wed 19 Jul 2006 - 14:20:13 EST


Hi,
I'm trying to fit a ordered logistic regression. The response variable
(y) has three levels (0,1,2).
The command I've used is:

ordlog<-polr(y~x1+x2+x3+x4, data=finalbase, subset=heard, weight=wt, na.action=na.omit)

(There are no NA's in y but there are NA's in X's)

The error I'm getting is:
Warning messages:
1: non-integer #successes in a binomial glm! in: eval(expr, envir, enclos) 2: design appears to be rank-deficient, so dropping some coefs in: polr(right.ans ~ S107 + children + work + rel + media + V013 +

Also, if I write
summary(ordlog)

I'm getting the following error:

Re-fitting to get Hessian

Error in if (all(pr > 0)) -sum(wt * log(pr)) else Inf :

       missing value where TRUE/FALSE needed

Could anybody point out the problem?

Thanks,
Debarchana.

-- 
Debarchana Ghosh
Research Assistant
Department of Geography
University of Minnesota
PH: 8143607580
email to: ghos0033@umn.edu
www.tc.umn.edu/~ghos0033

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Received on Wed Jul 19 14:25:54 2006

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