I have been experimenting with different clustering solutions using the simple matching coefficient with 13 dichotomous variables on 710 subjects. The solution that makes the most sense uses the WAVERAGE method. I have found a good deal about BAVERAGE (or UPGMA) but nothing about the within group clustering method other than a statement by Aldenderfer & Blashfield (1984, Sage) saying there are a number of variants to the average clustering method. Can anyone give me more information? I've looked in Lorr (1983, Jossey-Bass) and Romesburg (1984, 1990, Krieger) without help. Specifically, is this an appropriate method to use? What's the difference between it and the between link group averaging method? --------------------------------------------------------------- Joe E. Wheaton, Ph.D. | (614)292-8313 -- OSU The Ohio State University | (614)292-4255 -- FAX 356 Arps Hall, 1945 N. High St. | WHEATON.3@OSU.EDU Columubus, OH 43210-1172