On Fri, 22 Jul 2005, Baoqiang Cao wrote: > Dear All, > > I have such a two-class problem, one class is very large(~98% of total), > and the other is just 2%. According to manual of nnet, I need setup > "weights", so I intend to set 1 for class one, 49 for class 2. How do I > do that? Just weights=49?
I do not know what you mean by `manual of nnet', but no, not that since the help page says weights: (case) weights for each example - if missing defaults to 1. More likely you want ifelse(class==1, 1/49, 1). However, there is more to it than that, and do please read the reference books on the help page. -- 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://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
