skip_if_not_installed("plm")
data(Crime, package = "plm")
m1 <- suppressWarnings(
plm::plm(
lcrmrte ~ lprbarr + factor(year) | . - lprbarr + lmix,
data = Crime,
model = "random"
)
)
set.seed(123)
data("Produc", package = "plm")
m2 <- suppressWarnings(plm::plm(
formula = log(gsp) ~ log(pcap) + log(pc) + log(emp) + unemp,
data = Produc,
index = c("state", "year")
))
test_that("model_info", {
expect_true(model_info(m1)$is_linear)
})
test_that("find_predictors", {
expect_identical(
find_predictors(m1),
list(
conditional = c("lprbarr", "year"),
instruments = c("lprbarr", "lmix")
)
)
expect_identical(
find_predictors(m1, flatten = TRUE),
c("lprbarr", "year", "lmix")
)
expect_null(find_predictors(m1, effects = "random"))
})
test_that("find_random", {
expect_null(find_random(m1))
})
test_that("get_random", {
expect_warning(get_random(m1))
})
test_that("find_response", {
expect_identical(find_response(m1), "lcrmrte")
})
test_that("get_response", {
expect_equal(get_response(m1), Crime$lcrmrte, tolerance = 1e-4, ignore_attr = TRUE)
})
test_that("get_predictors", {
expect_named(get_predictors(m1), c("lprbarr", "year", "lmix"))
})
test_that("link_inverse", {
expect_equal(link_inverse(m1)(0.2), 0.2, tolerance = 1e-5)
})
test_that("get_data", {
expect_identical(nrow(get_data(m1)), 630L)
expect_named(get_data(m1), c("lcrmrte", "lprbarr", "year", "lmix"))
expect_identical(nrow(get_data(m2)), 816L)
expect_named(get_data(m2), c("gsp", "pcap", "pc", "emp", "unemp", "state", "year"))
})
test_that("find_formula", {
expect_length(find_formula(m1), 2)
expect_equal(
find_formula(m1),
list(
conditional = as.formula("lcrmrte ~ lprbarr + factor(year)"),
instruments = as.formula("~-lprbarr + lmix")
),
ignore_attr = TRUE
)
})
test_that("find_variables", {
expect_identical(
find_variables(m1),
list(
response = "lcrmrte",
conditional = c("lprbarr", "year"),
instruments = c("lprbarr", "lmix")
)
)
expect_identical(
find_variables(m1, flatten = TRUE),
c("lcrmrte", "lprbarr", "year", "lmix")
)
})
test_that("n_obs", {
expect_identical(n_obs(m1), 630L)
})
test_that("linkfun", {
expect_false(is.null(link_function(m1)))
})
test_that("find_parameters", {
expect_identical(
find_parameters(m1),
list(
conditional = c(
"(Intercept)",
"lprbarr",
"factor(year)82",
"factor(year)83",
"factor(year)84",
"factor(year)85",
"factor(year)86",
"factor(year)87"
)
)
)
expect_identical(nrow(get_parameters(m1)), 8L)
})
test_that("is_multivariate", {
expect_false(is_multivariate(m1))
})
test_that("find_statistic", {
expect_identical(find_statistic(m1), "z-statistic")
expect_identical(find_statistic(m2), "t-statistic")
})
skip_if_not_installed("withr")
withr::with_package(
"plm",
test_that("get_varcov, pgmm", {
data("EmplUK", package = "plm")
mar <- suppressWarnings(plm::pgmm(
log(emp) ~ lag(log(emp), 1:2) + lag(log(wage), 0:1) + log(capital) +
lag(log(capital), 2) + log(output) + lag(log(output), 2) | lag(log(emp), 2:99),
data = EmplUK, effect = "twoways", model = "twosteps"
))
out1 <- sqrt(diag(insight::get_varcov(mar, vcov = "HC1", component = "all")))
validate1 <- sqrt(diag(plm::vcovHC(mar)))
expect_equal(out1, validate1, tolerance = 1e-4, ignore_attr = TRUE)
})
)
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