code: def test_riskratio(self):
      assert_allclose(self.tbl_obj.riskratio, self.riskratio)
  
imports: import os
  import warnings
  import numpy
  import statsmodels.stats.contingency_tables
  import pandas
  from numpy.testing import assert_allclose, assert_equal
  import statsmodels.api
label_desc: Use image node_id 7 for calling the Check2x2Mixin obj's underlying member method code with example usage: obj.test_riskratio() without return types