Oups! I should have read further the help file... Thank you very much
|---------+----------------------------> | | [EMAIL PROTECTED]| | | F.COM | | | | | | 07/25/03 05:02 PM| | | | |---------+----------------------------> >------------------------------------------------------------------------------------------------------------------------------| | | | To: Vincent STOLIAROFF/fr/[EMAIL PROTECTED] | | cc: [EMAIL PROTECTED] | | Subject: Re: [R] named list 'start' in fitdistr | >------------------------------------------------------------------------------------------------------------------------------| An example in help(fitdistr) (R 1.7.1 for Windows) is "fitdistr(x, dgamma, list(shape = 1, rate = 0.1), lower = 0.01)". Based on this, have you tried the following: >>fitdistr(test,"lognormal", start=list(meanlog=0, sdlog=1)) hope this helps. spencer graves [EMAIL PROTECTED] wrote: > Hi R lovers! > > I'd like to know how to use the parameter 'start' in the function > fitdistr() > obviously I have to provide the initial value of the parameter to optimize > except in the case of a certain set of given distribution > > > Indeed according to the help file for fitdistr > " For the following named distributions, reasonable starting values > will be computed if `start' is omitted or only partially > specified: `cauchy', `gamma', `logistic', `negative binomial' (R > only, parametrized by `mu' and `size'), `t', `uniform', `weibull'. " > > > However I cannot fit an univariate distribution named 'test' > > I get this: > > >>fitdistr(test,"lognormal") > > Error in fitdistr(test, "lognormal") : `start' must be a named list > > >>fitdistr(test,"lognormal",start$meanlog=0,start$sdlog=1) > > Error: syntax error > > How I am supposed to type a value for start depending on the distribution > on which I am fitting my set > > thanks > > > > > ****************************************************************** > The sender's email address has changed to > firstname.lastname@ sgcib.com. You may want to update your > personal address book. Please see http://www.sgcib.com for more > information. > ** > This message and any attachments (the "message") are confide... {{dropped}} > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help ****************************************************************** The sender's email address has changed to firstname.lastname@ sgcib.com. You may want to update your personal address book. Please see http://www.sgcib.com for more information. ** This message and any attachments (the "message") are confide...{{dropped}} ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help