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from statsmodels.stats.descriptivestats import sign_test
from numpy.testing import assert_almost_equal, assert_equal
def test_sign_test():
x = [7.8, 6.6, 6.5, 7.4, 7.3, 7., 6.4, 7.1, 6.7, 7.6, 6.8]
M, p = sign_test(x, mu0=6.5)
# from R SIGN.test(x, md=6.5)
# from R
assert_almost_equal(p, 0.02148, 5)
# not from R, we use a different convention
assert_equal(M, 4)