On Feb 24 2004, Prof Brian Ripley wrote:
Why have you sent a message about S-PLUS to R-help, one that has already been answered on S-news?
There is no function nlminb in R.
On 24 Feb 2004, C. Spanou wrote:
> 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, lower=-Inf, upper=Inf) > > > when returning a warning message of singularity means that the > optimization algorithm thinks it can't make any further progress > because it has too many degrees of freedom. It usually means that the > objective function is either not differentiable, or it may not have an > optimum.
> > So for my data an optimum can't be obtained.
> Is this true?
> > Can I ignore this warning message since what I want to find is values > for the boundaries? Will the values for the boundaries be accurate even > though I get the warning message?
> > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read > the posting guide! http://www.R-project.org/posting-guide.html
> >
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