Nothing
test_that("wtd", {
data(efc)
set.seed(123)
efc$weight <- abs(rnorm(nrow(efc), 1, 0.3))
expect_equal(weighted_se(efc$c12hour, weights = efc$weight), 1.704182, tolerance = 1e-5)
expect_equal(weighted_se(efc$c12hour, weights = NULL), 1.691623, tolerance = 1e-5)
})
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