class_docstr: Base results class for cointegration tests.
  
  Parameters
  ----------
  stat : float
      The Engle-Granger test statistic.
  pvalue : float
      The pvalue of the Engle-Granger test statistic.
  crit_vals : Series
      The critical values of the Engle-Granger specific to the sample size
      and model dimension.
  null : str, default "No Cointegration"
      The null hypothesis.
  alternative : str, default "Cointegration"
      The alternative hypothesis.
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docstr: The test statistic.
docstr_tok: ["The","test","statistic","."]
code: def stat(self) -> float:
      """The test statistic."""
      return self._stat
  
imports: from __future__ import annotations
  from typing import Any, NamedTuple, cast
  import pandas
  from statsmodels.iolib.summary import Summary
  from statsmodels.regression.linear_model import OLS, RegressionResults
  import arch.covariance.kernel
  from arch.typing import ArrayLike1D, ArrayLike2D, UnitRootTrend
  from arch.utility.array import ensure1d, ensure2d
  from arch.utility.timeseries import add_trend
label_desc: Use image node_id 4 for calling the CointegrationTestResult obj's underlying member method code with example usage: obj.stat() and returns: self