def arParams(x, times=None, min_len=20, maxlag=3):
'''
:param x: input of the AR model
:param times:
:param min_len:
:param maxlag: maximum lag
:return: params, and loglike score
'''
model = AR(endog=x)
model_fitted = model.fit(maxlag=maxlag, maxiter=200)
loglike_score = model.loglike(model_fitted.params)
return model_fitted.params, loglike_score
