statsmodels.tsa.ar_model.AR.loglike
-
AR.loglike(params)
[source] -
The loglikelihood of an AR(p) process
Parameters: params : array
The fitted parameters of the AR model
Returns: llf : float
The loglikelihood evaluated at
params
Notes
Contains constant term. If the model is fit by OLS then this returns the conditonal maximum likelihood.
If it is fit by MLE then the (exact) unconditional maximum likelihood is returned.
where
is a (
p
x 1) vector with each element equal to the mean of the AR process and is the (p
xp
) variance-covariance matrix of the firstp
observations.
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