All - 

I am evaluating an arima(2,1,3) and arima(3,1,3) and notice the 
log-likelihood of the restricted model is higher than the log-likelihood 
of the unrestricted. 

Since these are nested models, I thought the unrestricted model would have 
a log-likelihood at least as large as that of the restricted model.  Am I 
interpreting the "loglik" output incorrectly?

Regards,

   
Stephen Collins, MPP | Analyst
Health & Benefits | Aon Consulting
200 East Randolph, Suite 900, Chicago, IL
Tel: 312-381-2578 | Fax: 312-381-0136
Email: stephen_collins@aon.com
 
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