tests/testthat/test_00_SN1.R

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

#######################################
#######     gamlss.dist        ########
#######   Distribution tests   ########
##### Skew normal type 1: SN1()  ######
#######################################

## Context
testthat::context("SN1")

## Seed
set.seed(333)

## Family
fam <- SN1()

## Random Values
mu <- 0
sigma <- 1
nu <- 0
rvec <- rSN1(1e4, 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
expect_true(abs(ex_emp - ex_theo) < 0.02) # larger difference because low random sample, would take too long otherwise.
expect_true(abs(vx_emp - vx_theo) < 0.02)