code: def setup_class(cls):
      cls.model = OaxacaBlinder(endog, exog, 3, swap=False)
  
imports: import numpy
  from statsmodels.datasets.ccard.data import load_pandas
  from statsmodels.stats.oaxaca import OaxacaBlinder
  from statsmodels.tools.tools import add_constant
label_desc: Use image node_id 1 for calling the TestOaxacaNoSwap obj's underlying member method code with example usage: obj.setup_class(cls) without return types