R Under development (unstable) (2024-07-10 r86888 ucrt) -- "Unsuffered Consequences"
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> if(FALSE)
+ {
+   
+   require(fitdistrplus)
+   
+   
+   #test actuar initialization
+   
+   startargdefault <- fitdistrplus:::startargdefault
+   
+   #burr
+   library(actuar)
+   alpha <- 3
+   x <- rburr(1000, alpha, 4, .1)
+   
+   initburr <- function(x)
+   {
+     pi <- 1:3/4
+     qi <- 1-pi
+     xi <- as.numeric(quantile(x, probs=pi))
+     y <- log(xi[2])/log(xi[1]/xi[2])
+     y1 <- log(xi[3]/xi[2])/log(xi[2]/xi[1])
+     y2 <- log(xi[1]/xi[3])/log(xi[2]/xi[1])
+     f <- function(eta)
+       (qi[1]^eta-1)^y1*(qi[2]^eta-1)^y2*(qi[3]^eta-1) - 1
+     eta <- try(uniroot(f, c(-10, -1e-6))$root, silent=TRUE)
+     if(inherits(eta, "try-error"))
+       eta <- -1
+     alpha <- -1/eta
+     lambda <- (qi[1]^eta-1)^y*(qi[2]^eta-1)^(-y-1)
+     gamma <- log(lambda*(qi[1]^eta-1))/log(xi[1])
+     theta <- lambda^(1/gamma)
+     list(shape1=alpha, shape2=gamma, rate=1/theta)
+   }
+   
+   initburr(x)
+   
+   #fitdist(x, "burr", lower=0, start=initburr(x))
+   
+   #transformed gamma
+   x <- rtrgamma(1000, 3, 2, .1)
+   
+   start1 <- startargdefault(x, "trgamma")
+   
+   plot(ecdf(x))
+   curve(ptrgamma(x, start1$shape1, start1$shape2, start1$rate), add=TRUE, lty=2)
+   
+   #fitdist(x, "trgamma", lower=0)
+   
+   #inverse transformed gamma
+   y <- rinvtrgamma(1000, 3, 2, .1)
+   
+   start1 <- startargdefault(y, "invtrgamma")
+   
+   plot(ecdf(y))
+   curve(pinvtrgamma(x, start1$shape1, start1$shape2, start1$rate), add=TRUE, lty=2)
+   
+   #fitdist(y, "invtrgamma")
+   
+   
+ }
> 
> proc.time()
   user  system elapsed 
   0.14    0.10    0.23