CRL English Routing System for TREC-5

The routing system was initially developed as a final filter to rank documents being produced by multiple queries given to a Boolean retrieval system. It was decided to use the filtering component on its own for the routing task. The router was trained using the relevance judgments from previous evaluations. It is based on a theoretical approach for discriminating between two different types of documents developed by Guthrie and Walker. The method is similar in many ways to a vector based retrieval system, with a vector for each topic being matched against a word vector for the document. The results for the method are poor