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 whiten(self, x):
      return whiten_ar(x, self.ar_coefs, order=self.order)
  
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 3 for calling the ARCovariance obj's underlying member method code with example usage: obj.whiten(x) and returns: whiten_ar