On Mon, 7 Jun 2004, Jingky Lozano wrote: > Good day R help list!!! > > I've been trying to do Bootstrap in R on Censored data. I encountered > WARNING/ERROR messages which I could not find explanation. > I've been searching on the literature for two days now and still can't find > answers. I hope there's anyone out there who can help me > with these two questions: > > 1. If the "Loglik converged before variable..." message appears (please see > printout below) while doing ordinary bootstrap, > does it mean that I cannot trust the result of the bootstrap statistics? Is > there a valid way to resolve it like increase the sample size?
This is a message from coxph and nothing at all to do with censboot. > 2. In doing conditional bootstrap with survival data, how can one handle a data > with two largest survival time observations (ties) > but one is censored while the other is not. For example, if the censoring time > is 48 months and a patient died exactly at that time, he will > have the same survival time as another patient who was also observed to lived 48 > months long but classified as censored because he was still > alive at the set censoring time. Doing the recommended algorithm in R gives an > "error in sample length..." message. Recommended by whom? You could break the ties (death first) and avoid the problem. -- 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