code: def test_ros_arrays(self):
      result = ros.impute_ros(
          self.df[self.rescol], self.df[self.cencol], df=None
      )
      npt.assert_array_almost_equal(
          sorted(result),
          sorted(self.expected_final),
          decimal=self.decimal,
      )
  
imports: from statsmodels.compat.pandas import assert_series_equal, assert_frame_equal
  from io import StringIO
  from textwrap import dedent
  import numpy
  import numpy.testing
  import numpy
  from numpy.testing import assert_equal
  import pandas
  import pytest
  from statsmodels.imputation import ros
label_desc: Use image node_id 2 for calling the CheckROSMixin obj's underlying member method code with example usage: obj.test_ros_arrays() without return types