Members of the group I hope the is the right place fo my question.

I have been using several of the functions in the  Time Series toolbox of Mathematica. I am particularly interested in identifying models for electricity price forecasting.  
TimeSeriesForcast is a Mathematica function that I am using to perform forecast for several steps ahead.  An option for this function is the method, for instance, Method->"AR".
How can I know the order of the model being used in the approximation? I cannot find these kind of details in the help section.

Thanks for any help you could give

Jesus Rico-Melgoza