[R] Problem with ordered logistic regression using polr function.
Debarchana Ghosh
ghos0033 at umn.edu
Wed Jul 19 06:17:50 CEST 2006
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 at umn.edu
www.tc.umn.edu/~ghos0033
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