docstr: The estimated cointegrating vector.
docstr_tok: ["The","estimated","cointegrating","vector","."]
code: def cointegrating_vector(self) -> pd.Series:
      """
      The estimated cointegrating vector.
      """
      params = self._xsection.params
      index = [self._xsection.model.data.ynames]
      return pd.concat([pd.Series([1], index=index), -params], axis=0)
  
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 ResidualCointegrationTestResult obj's underlying member method code with example usage: obj.cointegrating_vector() and returns: pd