code: def test_efficient_user_specificed_bw(self):
      bw_user = [0.23, 434697.22]
      model = nparam.KernelReg(
          endog=[self.y],
          exog=[self.c1, self.c2],
          reg_type="lc",
          var_type="cc",
          bw=bw_user,
          defaults=nparam.EstimatorSettings(efficient=True),
      )
      # Bandwidth
      npt.assert_equal(model.bw, bw_user)
  
imports: import pytest
  import numpy
  import numpy.testing
  import statsmodels.api
label_desc: Use image node_id 14 for calling the TestKernelReg obj's underlying member method code with example usage: obj.test_efficient_user_specificed_bw() without return types