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 fit(cls, cov, order, **kwds):
      rho, sigma = yule_walker_acov(cov, order=order, **kwds)
      return cls(ar_coefs=rho)
  
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 2 for calling the ARCovariance obj's underlying member method code with example usage: obj.fit(cls, cov, order) and returns: cls