code: def setup_class(cls):
      cls.model = OaxacaBlinder(
          pandas_df.endog.values,
          pandas_df.exog.values,
          3,
          hasconst=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 TestOaxacaNoConstPassed obj's underlying member method code with example usage: obj.setup_class(cls) without return types