class_docstr: experimental class for Covariance of AR process
  classmethod? staticmethods?
class_docstr_tok: ["experimental","class","for","Covariance","of","AR","process","classmethod","?","staticmethods","?"]
code: def cov(self, k_vars=None):
      return cov2corr(self.corr(k_vars=None), self.sigma)
  
file_path: statsmodels/statsmodels/sandbox/panel/correlation_structures.py
imports: import numpy
  from statsmodels.regression.linear_model import yule_walker
  from statsmodels.stats.moment_helpers import cov2corr
label_desc: Use image node_id 5 for calling the ARCovariance obj's underlying member method code with example usage: obj.cov(k_vars) and returns: cov2corr