AMR/tests/testthat/test-g.test.R

context("g.test.R")

test_that("G-test works", {

  # GOODNESS-OF-FIT

  # example 1: clearfield rice vs. red rice
  x <- c(772, 1611, 737)
  x.expected <- ratio(x, ratio = "1:2:1")
  expect_equal(g.test(x, p = c(0.25, 0.50, 0.25))$p.value,
               expected = 0.12574,
               tolerance = 0.00001)

  # example 2: red crossbills
  x <- c(1752, 1895)
  x.expected <- ratio(x, c(1, 1))
  expect_equal(g.test(x)$p.value,
               expected = 0.01787343,
               tolerance = 0.00000001)


  # INDEPENDENCE

  x <- matrix(data = round(runif(4) * 100000, 0),
              ncol = 2,
              byrow = TRUE)
  expect_lt(g.test(x)$p.value,
            1)

  expect_warning(g.test(x = c(772, 1611, 737),
                        y = c(780, 1560, 780),
                        rescale.p = TRUE))

})