[R] Error code 100 when using the function “fitdist” from the fitdistrplus package

Nelly Reduan
Wed, 03 Aug 2016 23:42:05 -0000

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Hello,

I?m trying to fit distributions to data. To do this, I used the function
?fitdist? from the fitdistrplus package and I drew a Cullen and Frey graph
(attached Figure 1). From this graph, I am attempting to fit different
distributions: Beta, Gamma and Weibull. The function ?fitdist? works with Gamma
distribution from this code:

Fit.dist <- fitdist(x[x!=0], distr="gamma",
method="mle",lower=c(0, 0),start=list(scale=1,shape=1))

However, with Beta and Weibull distributions, I obtain this error message:

  the function mle failed to estimate the parameters,

                with the error code 100



Here is my code to fit Beta and Weibull distributions:

fit.dist <- fitdist(x_scaled, distr="beta", method =
"mle")

fit.dist <- fitdist(x, distr="weibull", method="mle",
lower=c(0, 0))

For the Beta distribution, I transformed the variable to have values between 0
and 1 as follows:

x_scaled  <- (x-min(x))/max(x)

Here are some information about data (summary() and attached Figure 2)

> summary(x)

   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.

    0.0    90.4   244.8   437.4   549.4  4904.0

 How can I fit Gamma and Weibull distributions to my data without having the
error message ?

Thank you very much for your time.

Nell


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