A model designed to represent procedures that experts use in making decisions or forecasts. Often, these procedures are supplemented by other information, such as estimates from <a href="search.pl?p=econometric models">econometric models</a>. The term has also been applied to procedures for selecting forecasting methods. Armstrong, Adya and Collopy (2001) discuss principles for developing expert systems for forecasting. <o:p></o:p></P>
 <ul>
   <li>Armstrong, J. S., M. Adya &amp; F. Collopy (2001), 
“Rule-based forecasting: Using judgment in time-series<SPAN 
style="mso-spacerun: yes">&nbsp; </SPAN>extrapolation,” in J. S. Armstrong 
(ed.), <I>Principles of Forecasting.</I> Norwell, MA: Kluwer Academic 
Press.</li>
 </ul>