code: def test_remove_data_docstring(self):
      assert self.results.remove_data.__doc__ is not None
  
imports: from statsmodels.compat.pandas import assert_series_equal
  from io import BytesIO
  import pickle
  import numpy
  import pandas
  import statsmodels.api
label_desc: Use image node_id 3 for calling the RemoveDataPickle obj's underlying member method code with example usage: obj.test_remove_data_docstring() without return types