Hi, Does anyone know of an R package or set of functions for doing Total Unduplicated Reach and Frequency (TURF) analysis? This is somewhat popular in the advertising area. Thanks, Walt -- ________________________ Walter R. Paczkowski, Ph.D. Data Analytics Corp. 44 Hamilton Lane Plainsboro, NJ 08536 ________________________ (V) 609-936-8999 (F) 609-936-3733 dataanalytics at earthlink.net www.dataanalyticscorp.com