tests/testthat/test_01_DEL.R

In Stan125/gamlss.dist: Distributions for Generalized Additive Models for Location Scale and Shape

######################################
#######     gamlss.dist        #######
#######   Distribution tests 2 #######
#######     Delaporte: DEL()   #######
######################################

## Context
testthat::context("DEL 2")

## Seed
set.seed(231)

## Family
fam <- DEL()

## Random Values
i <- 0.2
n <- 1e4  
mu <- 1 + i 
sigma <- 1 + i 
nu <- 0.5 + i 
rvec <- rDEL(n, mu, sigma, nu) 

## Empirical Moments
ex_emp <- mean(rvec)
vx_emp <- var(rvec)

## Theoretical moments
ex_theo <- fam$mean(mu, sigma, nu)
vx_theo <- fam$variance(mu, sigma, nu)

## Test here if they are about the same
expect_true(abs(ex_emp - ex_theo) < 0.02)  
expect_true(abs(vx_emp - vx_theo) < 0.02)