class_docstr: Results class for OrderedModel
  
  This class inherits from GenericLikelihoodModelResults and not all
  inherited methods might be appropriate in this case.
docstr: Likelihood ratio chi-squared statistic; `-2*(llnull - llf)`
code: def llr(self):
      """
      Likelihood ratio chi-squared statistic; `-2*(llnull - llf)`
      """
      return -2 * (self.llnull - self.llf)
  
imports: import warnings
  from statsmodels.compat.pandas import Appender
  import numpy
  import pandas
  from pandas.api.types import CategoricalDtype
  from scipy import stats
  from statsmodels.base.model import Model, LikelihoodModel, GenericLikelihoodModel, GenericLikelihoodModelResults
  import statsmodels.base.wrapper
  import statsmodels.regression.linear_model
  from statsmodels.tools.decorators import cache_readonly
label_desc: Use image node_id 4 for calling the OrderedResults obj's underlying member method code with example usage: obj.llr() and returns: unknown