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newdata
2004 Feb 24
2
convergence in polr
Hello splus-users, I am trying to fit a regression model for an ordered
response factor. So I am using the function polr in library(MASS). My data
is a matrix of 1665 rows and 63 columns (one of the column is the dependent
variable). The code I use is polr(as.ordered(q23p)~.,data=newdatap)
but I am getting the following warning message singularity encountered in:
nlminb.1(temp, p, liv, lv, objective, gradient, bounds, scale)
I looked in the MASS help for nlminb and I found that for the function
nlminb(start, objective, gradient=NULL, hessian=NULL,
scale=1, control=NULL,...