Nothing
test_that("Exponential distribution", {
dist <- dist_exponential(2)
expect_equal(format(dist), "Exp(2)")
# quantiles
expect_equal(quantile(dist, 0.1), stats::qexp(0.1, 2))
expect_equal(quantile(dist, 0.5), stats::qexp(0.5, 2))
# pdf
expect_equal(density(dist, 0), stats::dexp(0, 2))
expect_equal(density(dist, 3), stats::dexp(3, 2))
# cdf
expect_equal(cdf(dist, 0), stats::pexp(0, 2))
expect_equal(cdf(dist, 3), stats::pexp(3, 2))
# F(Finv(a)) ~= a
expect_equal(cdf(dist, quantile(dist, 0.4246)), 0.4246, tolerance = 1e-3)
# stats
expect_equal(mean(dist), 1/2)
expect_equal(variance(dist), 1/2^2)
})
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