The ARIMA Procedure 
The MINIC Method 
The minimum information criterion (MINIC) method can tentatively identify the order of a stationary and invertible ARMA process. Note that Hannan and Rissannen (1982) proposed this method, and Box, Jenkins, and Reinsel (1994) and Choi (1992) provide useful descriptions of the algorithm.
Given a stationary and invertible time series with mean corrected form with a true autoregressive order of and with a true movingaverage order of , you can use the MINIC method to compute information criteria (or penalty functions) for various autoregressive and moving average orders. The following paragraphs provide a brief description of the algorithm.
If the series is a stationary and invertible ARMA(p, q ) process of the form
the error series can be approximated by a highorder AR process
where the parameter estimates are obtained from the YuleWalker estimates. The choice of the autoregressive order is determined by the order that minimizes the Akaike information criterion (AIC) in the range
where
Note that Hannan and Rissannen (1982) use the Bayesian information criterion (BIC) to determine the autoregressive order used to estimate the error series. Box, Jenkins, and Reinsel (1994) and Choi (1992) recommend the AIC.
Once the error series has been estimated for autoregressive test order and for movingaverage test order , the OLS estimates and are computed from the regression model
From the preceding parameter estimates, the BIC is then computed
where
where .
A MINIC table is then constructed using ; see Table 7.6. If , the preceding regression might fail due to linear dependence on the estimated error series and the meancorrected series. Values of that cannot be computed are set to missing. For large autoregressive and movingaverage test orders with relatively few observations, a nearly perfect fit can result. This condition can be identified by a large negative value.
MA 

AR 
0 
1 
2 
3 


0 






1 






2 






3 




















Copyright © SAS Institute, Inc. All Rights Reserved.