docstr: The number of stochastic trends under the null hypothesis.
docstr_tok: ["The","number","of","stochastic","trends","under","the","null","hypothesis","."]
code: def distribution_order(self) -> int:
      """The number of stochastic trends under the null hypothesis."""
      return self._order
  
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 3 for calling the ResidualCointegrationTestResult obj's underlying member method code with example usage: obj.distribution_order() and returns: self