code: def setup_class(cls):
      data = macrodata.load_pandas()
      cls.x = data.data["realgdp"].values
      cls.bc = BoxCox()
  
file_path: statsmodels/statsmodels/base/tests/test_transform.py
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_equal, assert_raises
  from statsmodels.base.transform import BoxCox
  from statsmodels.datasets import macrodata
label_desc: Use image node_id 1 for calling the TestTransform obj's underlying member method code with example usage: obj.setup_class(cls) without return types