Dear Sir/Madam, Could you please inform me as to whether or not there are any R functions which can calculate the confidence limits for a non-linear regression curve? Thank you ____________________________ Richard Sayers ESDU International plc 27 Corsham Street London N1 6UA England Tel: 44-(0)20 7566 5714 Fax: 44-(0)20 7490 2701 Email: rsay at esdu.com -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
On Thu, 4 Jan 2001, Richard Sayers wrote:> Dear Sir/Madam, > > Could you please inform me as to whether or not there are any R > functions which can calculate the confidence limits for a non-linear > regression curve?confint.nls in package MASS in bundle VR, if you are using nls for fit. -- Brian D. Ripley, ripley at stats.ox.ac.uk 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 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Dear friends of nls, I have tried confint.nls on a few logistic regression fit; all curves are well-behaved. Only in 1 out of 3 cases, the method converged, it stopped on the other cases with "singular matrix" or "number of iterations exceeded". I have put in the intermediate step by computing the profiles first and manipulating alphamax and delta.t, but I could not find a compromise that worked. Anybody can give me a hint? Dieter (Sorry, could not find the right method to reply to a thread found in the archives) --------------------------------------- Dr. Dieter Menne Biomed Software 72074 T?bingen Tel (49) (7071) 52176 FAX (49) (7071) 55 10 46 dieter.menne at menne-biomed.de www.menne-biomed.de -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._