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 <- vector2ratio(x, ratio = "1:2:1")
  expect_equal(g.test(x, x.expected),
               expected = 0.12574,
               tolerance = 0.00001)

  # example 2: red crossbills
  x <- c(1752, 1895)
  x.expected <- vector2ratio(x, ratio = c(1, 1))
  expect_equal(g.test(x, x.expected),
               expected = 0.01787343,
               tolerance = 0.00000001)

  # INDEPENDENCE

  # this should always yield a p value of around 0
  x <- matrix(data = round(runif(4) * 100000, 0),
              ncol = 2,
              byrow = TRUE)
  expect_lt(g.test(x),
            0.0001)

})