We develop an automatic text categorization approach and investigate its application to text retrieval. The categorization approach is derived from a combination of a learning paradigm known as instancebased learning and an advanced document retrieval technique known as retrieval feedback. We demonstrate the e ectiveness of our categorization approach using two real-world document collections f...

This article is drawn from a report created for the American College of Emergency Physicians (ACEP) Emergency Department (ED) Categorization Task Force and also reflects the proceedings of a breakout session, "Beyond ED Categorization-Matching Networks to Patient Needs," at the 2010 Academic Emergency Medicine consensus conference, "Beyond Regionalization: Integrated Networks of Emergency Care....