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 > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [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