code: def test_medcouple_no_axis(self):
      x = np.reshape(np.arange(100.0), (50, 2))
      mc = medcouple(x, axis=None)
      assert_almost_equal(mc, medcouple(x.ravel()))
  
imports: import numpy
  import pandas
  from numpy.testing import assert_almost_equal, assert_raises, assert_equal, assert_allclose
  from statsmodels.stats._adnorm import normal_ad
  from statsmodels.stats.stattools import omni_normtest, jarque_bera, durbin_watson, _medcouple_1d, medcouple, robust_kurtosis, robust_skewness
label_desc: Use image node_id 2 for calling the TestStattools obj's underlying member method code with example usage: obj.test_medcouple_no_axis() without return types