[R] Problem with ordered logistic regression using polr function.

From: Debarchana Ghosh <ghos0033_at_umn.edu>
Date: Wed 19 Jul 2006 - 14:17:50 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 14:23:42 2006

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