Hi Stacy and whoever else is intersted, I found a promising tutorial on LSI using Matlab. Have you seen this it? It includes sample data to test with. http://www.joma.org/images/upload_library/4/vol5/search/JOMASEMatlab.html from this article: http://www.joma.org/mathDL/4/?pa=content&sa=viewDocument&nodeId=636&bodyId=1104 -A