A Practitioner's Guide to Resampling for Data Analysis, Data Mining, and Modeling is now available in paperback from http://www.amazon.com/Practitioners-Resampling-Analysis-Mining-Modeling/dp/1439855501 and http://www.crcpress.com/utility_search/search_results.jsf?conversationId=32501 or as a pdf file from http://statcourse.com DM You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.