R Under development (unstable) (2024-07-10 r86888 ucrt) -- "Unsuffered Consequences"
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> library(fitdistrplus)
Loading required package: MASS
Loading required package: survival
> 
> # (1) basic fit of a gamma distribution by maximum likelihood estimation
> #
> data(groundbeef)
> serving <- groundbeef$serving
> fitg <- fitdist(serving, "gamma")
> 
> logLik(fitg)
[1] -1253.626
> vcov(fitg)
            shape         rate
shape 0.115727238 1.570141e-03
rate  0.001570141 2.419982e-05
> coef(fitg)
     shape       rate 
3.99526328 0.05423688 
> AIC(fitg)
[1] 2511.252
> AIC(fitg, k = log(fitg$n)) # should give BIC
[1] 2518.326
> BIC(fitg)
[1] 2518.326
> 
> fitg <- fitdist(serving, "gamma", method="mme")
> 
> logLik(fitg)
[1] -1253.825
> vcov(fitg) 
           shape        rate
shape 44.2171593 0.600404069
rate   0.6004041 0.008932239
> coef(fitg)
     shape       rate 
4.22848617 0.05741663 
> AIC(fitg)
[1] 2511.65
> AIC(fitg, k = log(fitg$n)) # should give BIC
[1] 2518.724
> BIC(fitg)
[1] 2518.724
> 
> # (2) Fit of a lognormal distribution to bacterial contamination data
> #
> data(smokedfish)
> fitsf  <-  fitdistcens(smokedfish,"lnorm")
> logLik(fitsf)
[1] -90.65154
> vcov(fitsf) 
            meanlog       sdlog
meanlog  0.21502901 -0.09782285
sdlog   -0.09782285  0.23781325
> coef(fitsf)
  meanlog     sdlog 
-3.627606  3.544570 
> AIC(fitsf)
[1] 185.3031
> AIC(fitsf, k = log(fitsf$n)) # should give BIC
[1] 190.5725
> BIC(fitsf)
[1] 190.5725
> 
> 
> proc.time()
   user  system elapsed 
   1.57    0.17    1.73