Hi Why do you want to change your variable values? It smells a rat to me.
If you just change your a,b,c values nls arrives to some finite result (e.g. c=1.5 or c=0.3) . BTW by what magic you obtained such precise and wrong estimates for a,b,c? HTH Petr On 15 Aug 2006 at 5:54, Xiaodong Jin wrote: Date sent: Tue, 15 Aug 2006 05:54:51 -0700 (PDT) From: Xiaodong Jin <[EMAIL PROTECTED]> To: [email protected] Subject: [R] nls > Is there anyway to change any y[i] value (i=2,...6) to make > following NLS workable? > > x <- c(0,5,10,15,20,25,30) > y <- c(1.00000,0.82000,0.68000,0.64000,0.66667,0.68667,0.64000) > lm(1/y ~~ x) nls(1/y ~~ a+b*x^c, > start=list(a=1.16122,b=0.01565,c=1), trace=TRUE) > > #0.0920573 : 1.16122 0.01565 1.00000 > #Error in numericDeriv(form[[3]], names(ind), env) : > # Missing value or an infinity produced when evaluating the > # model > > > --------------------------------- > > > [[alternative HTML version deleted]] > > ______________________________________________ > [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 and provide commented, > minimal, self-contained, reproducible code. Petr Pikal [EMAIL PROTECTED] ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
