Re: [R] Error when using fitdist function in R

Prof Brian Ripley Wed, 10 Apr 2013 00:50:50 -0700

On 10/04/2013 08:29, PIKAL Petr wrote:

Hi


where is function fitdist from? Do you by chance mean fitdistr from MASS 
package?


No, from the output.  More likely

fitdistrplus::fitdist   Fit of univariate distributions to non-censored
                        data

What is result of str(k)?

Without these questions answered you hardly get any useful answer.

Also, the data seem to be integers: a gamma distribution is for realpositive values only. Having zero values would give the results you see.


Regards
Petr

-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
project.org] On Behalf Of Paul Bernal
Sent: Tuesday, April 09, 2013 11:19 PM
To: r-help@r-project.org
Subject: [R] Error when using fitdist function in R

Hello everyone,

I  was trying to do some distribution fitting with a numerical field
called Tolls. The sample size = 999 rows.

Basically I assigned the Toll data to a new variable K by doing:
k<-dtest$Toll

After that, tried to fit a gamma distribution by doing: fitG<-
fitdist(k,
"gamma")

Then the following messages showed (oh and I checked for empty rows
before doing this):

Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
Warning in dgamma(c(363328L, 376216L, 367032L, 314826L, 311892L,
313340L,  :
   NaNs produced
[1] "Error in optim(par = vstart, fn = fnobj, fix.arg = fix.arg, obs =
data,  : \n  non-finite finite-difference value [2]\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in optim(par = vstart, fn = fnobj, fix.arg = fix.arg, obs
=
data,     ddistnam = ddistname, hessian = TRUE, method = meth, lower =
lower,     upper = upper, ...): non-finite finite-difference value [2]>
Error in fitdist(k, "gamma") :
   the function mle failed to estimate the parameters,
                 with the error code 100


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and provide commented, minimal, self-contained, reproducible code.



--
Brian D. Ripley,                  rip...@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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

______________________________________________
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.

Re: [R] Error when using fitdist function in R

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