On Jul 16, 2011, at 14:17 , Jochen1980 wrote: > Hi, > > I am using ecdf-function and want to use the ecdf()-data-points for nls() as > data-parameter. > nls() expects 'list' or 'environment' as a data-type, knots(ecdf(mydata)) > gives me 'numeric'. > What should I do now?
Consider using fitdistr() from the MASS package. What you're trying to do is just wrong! > > Thanks in advance - Jochen > > Here is the code: > ################################################# > # --- Fit --- > # Gumbel-Dist-Function, cumulative, > http://en.wikipedia.org/wiki/Gumbel_distribution > # ( - ( x - mue ) / beta ) > # ( -e )^ > # F(x) = e^ > # formula for fitting-function > # formula: y ~ I( exp(1) ^ ( - exp(1) ) ^ ( - ( x - mue ) / beta ) ) Ouch!!!! Do teach yourself what exp() means. I believe that wants to be exp( - exp( - ( x - mue ) / beta ) ) notice that fitdistr() needs the density, though. I.e. the derivative of the above with respect to x. -- Peter Dalgaard Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org 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.
