if (require("testthat") &&
require("insight") &&
require("betareg")) {
data("GasolineYield")
data("FoodExpenditure")
m1 <- betareg(yield ~ batch + temp, data = GasolineYield)
m2 <- betareg(I(food / income) ~ income + persons, data = FoodExpenditure)
test_that("model_info", {
expect_true(model_info(m1)$is_beta)
})
test_that("find_predictors", {
expect_identical(find_predictors(m1), list(conditional = c("batch", "temp")))
expect_identical(find_predictors(m1, flatten = TRUE), c("batch", "temp"))
expect_null(find_predictors(m1, effects = "random"))
})
test_that("find_response", {
expect_identical(find_response(m1), "yield")
expect_identical(find_response(m2), "I(food/income)")
expect_identical(find_response(m2, combine = FALSE), c("food", "income"))
})
test_that("get_response", {
expect_equal(get_response(m1), GasolineYield$yield)
expect_equal(get_response(m2), FoodExpenditure[, c("food", "income")])
})
test_that("link_inverse", {
expect_identical(link_inverse(m1)(.2), plogis(.2))
})
test_that("get_data", {
expect_equal(nrow(get_data(m1)), 32)
expect_equal(colnames(get_data(m1)), c("yield", "batch", "temp"))
expect_equal(nrow(get_data(m2)), 38)
expect_equal(
colnames(get_data(m2)),
c("I(food/income)", "income", "persons", "food", "income.1")
)
})
test_that("find_formula", {
expect_length(find_formula(m1), 1)
expect_equal(
find_formula(m1),
list(conditional = as.formula("yield ~ batch + temp"))
)
expect_equal(
find_formula(m2),
list(conditional = as.formula("I(food/income) ~ income + persons"))
)
})
test_that("find_variables", {
expect_equal(
find_variables(m1),
list(
response = "yield",
conditional = c("batch", "temp")
)
)
expect_equal(
find_variables(m1, flatten = TRUE),
c("yield", "batch", "temp")
)
expect_equal(
find_variables(m2, flatten = TRUE),
c("food", "income", "persons")
)
})
test_that("n_obs", {
expect_equal(n_obs(m1), 32)
})
test_that("is_multivariate", {
expect_false(is_multivariate(m1))
})
test_that("linkfun", {
expect_false(is.null(link_function(m1)))
})
test_that("find_parameters", {
expect_equal(
find_parameters(m1),
list(
conditional = c("(Intercept)", "batch1", "batch2", "batch3", "batch4", "batch5", "batch6", "batch7", "batch8", "batch9", "temp"),
precision = "(phi)"
)
)
expect_equal(nrow(get_parameters(m1)), 12)
expect_equal(
get_parameters(m1)$Parameter,
c(
"(Intercept)",
"batch1",
"batch2",
"batch3",
"batch4",
"batch5",
"batch6",
"batch7",
"batch8",
"batch9",
"temp",
"(phi)"
)
)
})
test_that("find_terms", {
expect_equal(
find_terms(m2),
list(
response = "I(food/income)",
conditional = c("income", "persons")
)
)
})
test_that("find_statistic", {
expect_identical(find_statistic(m1), "z-statistic")
expect_identical(find_statistic(m2), "z-statistic")
})
}
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