test_that("print.ChiSquare works", {
expect_output(print(ChiSquare(df = 1)), regexp = "ChiSquare")
})
test_that("random.ChiSquare work correctly", {
cs <- ChiSquare(1)
expect_length(random(cs), 1)
expect_length(random(cs, 100), 100)
expect_length(random(cs[-1], 1), 0)
expect_length(random(cs, 0), 0)
expect_error(random(cs, -2))
# consistent with base R, using the `length` as number of samples to draw
expect_length(random(cs, c(1, 2, 3)), 3)
expect_length(random(cs, cbind(1, 2, 3)), 3)
expect_length(random(cs, rbind(1, 2, 3)), 3)
})
test_that("pdf.ChiSquare work correctly", {
cs <- ChiSquare(1)
expect_equal(pdf(cs, 0), Inf)
expect_equal(pdf(cs, 1), dchisq(1, 1))
expect_equal(pdf(cs, -12), 0)
expect_length(pdf(cs, seq_len(0)), 0)
expect_length(pdf(cs, seq_len(1)), 1)
expect_length(pdf(cs, seq_len(10)), 10)
})
test_that("log_pdf.ChiSquare work correctly", {
cs <- ChiSquare(1)
expect_equal(log_pdf(cs, 0), Inf)
expect_equal(log_pdf(cs, 1), log(dchisq(1, 1)))
expect_equal(log_pdf(cs, -12), log(0))
expect_length(log_pdf(cs, seq_len(0)), 0)
expect_length(log_pdf(cs, seq_len(1)), 1)
expect_length(log_pdf(cs, seq_len(10)), 10)
})
test_that("cdf.ChiSquare work correctly", {
cs <- ChiSquare(1)
expect_equal(cdf(cs, 0), 0)
expect_equal(cdf(cs, 1), pchisq(1, 1))
expect_length(cdf(cs, seq_len(0)), 0)
expect_length(cdf(cs, seq_len(1)), 1)
expect_length(cdf(cs, seq_len(10)), 10)
})
test_that("quantile.ChiSquare work correctly", {
cs <- ChiSquare(1)
expect_equal(quantile(cs, 0), 0)
expect_equal(quantile(cs, 0.5), qchisq(0.5, 1))
expect_length(quantile(cs, seq_len(0)), 0)
expect_length(quantile(cs, c(0, 1)), 2)
})
test_that("{moments}.ChiSquare work correctly", {
df <- 5
cs <- ChiSquare(5)
expect_equal(mean(cs), df)
expect_equal(variance(cs), 2 * df)
expect_equal(skewness(cs), sqrt(8 / df))
expect_equal(kurtosis(cs), 12 / df)
})
test_that("vectorization of a ChiSquare distribution work correctly", {
d <- ChiSquare(c(1, 5))
d1 <- d[1]
d2 <- d[2]
## moments
expect_equal(mean(d), c(mean(d1), mean(d2)))
expect_equal(variance(d), c(variance(d1), variance(d2)))
expect_equal(skewness(d), c(skewness(d1), skewness(d2)))
expect_equal(kurtosis(d), c(kurtosis(d1), kurtosis(d2)))
## random
set.seed(123)
r1 <- random(d)
set.seed(123)
r2 <- c(random(d1), random(d2))
expect_equal(r1, r2)
## pdf, log_pdf, cdf
expect_equal(pdf(d, 0), c(pdf(d1, 0), pdf(d2, 0)))
expect_equal(log_pdf(d, 0), c(log_pdf(d1, 0), log_pdf(d2, 0)))
expect_equal(cdf(d, 0.5), c(cdf(d1, 0.5), cdf(d2, 0.5)))
## quantile
expect_equal(quantile(d, 0.5), c(quantile(d1, 0.5), quantile(d2, 0.5)))
expect_equal(quantile(d, c(0.5, 0.5)), c(quantile(d1, 0.5), quantile(d2, 0.5)))
expect_equal(
quantile(d, c(0.1, 0.5, 0.9)),
matrix(
rbind(quantile(d1, c(0.1, 0.5, 0.9)), quantile(d2, c(0.1, 0.5, 0.9))),
ncol = 3, dimnames = list(NULL, c("q_0.1", "q_0.5", "q_0.9"))
)
)
## elementwise
expect_equal(
pdf(d, c(0.25, 0.75), elementwise = TRUE),
diag(pdf(d, c(0.25, 0.75), elementwise = FALSE))
)
expect_equal(
cdf(d, c(0.25, 0.75), elementwise = TRUE),
diag(cdf(d, c(0.25, 0.75), elementwise = FALSE))
)
expect_equal(
quantile(d, c(0.25, 0.75), elementwise = TRUE),
diag(quantile(d, c(0.25, 0.75), elementwise = FALSE))
)
## support
expect_equal(
support(d),
matrix(
c(support(d1)[1], support(d2)[1], support(d1)[2], support(d2)[2]),
ncol = 2, dimnames = list(names(d), c("min", "max"))
)
)
expect_true(!any(is_discrete(d)))
expect_true(all(is_continuous(d)))
expect_true(is.numeric(support(d1)))
expect_true(is.numeric(support(d1, drop = FALSE)))
expect_null(dim(support(d1)))
expect_equal(dim(support(d1, drop = FALSE)), c(1L, 2L))
})
test_that("named return values for ChiSquare distribution work correctly", {
d <- ChiSquare(c(3, 10))
names(d) <- LETTERS[1:length(d)]
expect_equal(names(mean(d)), LETTERS[1:length(d)])
expect_equal(names(variance(d)), LETTERS[1:length(d)])
expect_equal(names(skewness(d)), LETTERS[1:length(d)])
expect_equal(names(kurtosis(d)), LETTERS[1:length(d)])
expect_equal(names(random(d, 1)), LETTERS[1:length(d)])
expect_equal(rownames(random(d, 3)), LETTERS[1:length(d)])
expect_equal(names(pdf(d, 0.5)), LETTERS[1:length(d)])
expect_equal(names(pdf(d, c(0.5, 0.7))), LETTERS[1:length(d)])
expect_equal(rownames(pdf(d, c(0.5, 0.7, 0.9))), LETTERS[1:length(d)])
expect_equal(names(log_pdf(d, 0.5)), LETTERS[1:length(d)])
expect_equal(names(log_pdf(d, c(0.5, 0.7))), LETTERS[1:length(d)])
expect_equal(rownames(log_pdf(d, c(0.5, 0.7, 0.9))), LETTERS[1:length(d)])
expect_equal(names(cdf(d, 0.5)), LETTERS[1:length(d)])
expect_equal(names(cdf(d, c(0.5, 0.7))), LETTERS[1:length(d)])
expect_equal(rownames(cdf(d, c(0.5, 0.7, 0.9))), LETTERS[1:length(d)])
expect_equal(names(quantile(d, 0.5)), LETTERS[1:length(d)])
expect_equal(names(quantile(d, c(0.5, 0.7))), LETTERS[1:length(d)])
expect_equal(rownames(quantile(d, c(0.5, 0.7, 0.9))), LETTERS[1:length(d)])
expect_equal(names(support(d[1])), c("min", "max"))
expect_equal(colnames(support(d)), c("min", "max"))
expect_equal(rownames(support(d)), LETTERS[1:length(d)])
})
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