By running this code:
set.seed(12)
eta <- 10
nu <- 2
n <- 100
t <- eta*(((-1)*log(1-runif(n)))^(1/nu))# generates T_i
t
library("fitdistrplus")
fitll <- fitdist(t, "llogis")
In R, I received this error:
Error in fitdist(t, "llogis") : The dllogis function must be defined
I had installed the package "fitdistrplus" before. Any ideas on how to fix this error? With other distributions, for example, "gamma" this code works fine.
Try this. It looks like the package with the desired distribution needs to be invoked (flexsurv):
set.seed(12)
eta <- 10
nu <- 2
n <- 100
t <- eta*(((-1)*log(1-runif(n)))^(1/nu))# generates T_i
t
library("fitdistrplus")
library(flexsurv)
fitll <- fitdist(t, "llogis")
fitll
Output:
fitll
Fitting of the distribution ' llogis ' by maximum likelihood
Parameters:
estimate Std. Error
shape 3.141862 0.2609741
scale 7.659338 0.4246839