Nothing
test_that("centered checks work", {
expect_true(is_centered(scaled_sum_code(2)))
expect_true(is_centered(scaled_sum_code(4)))
expect_true(is_centered(sum_code(4)))
expect_true(is_centered(helmert_code(2)))
expect_true(is_centered(contr.poly(2)))
expect_false(is_centered(contr.treatment(2)))
})
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