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Forgot to add one more statement to my previous reply. The simple reason that averaging the average does not work is it gives equal weight for a small population to that of a large population. Once the individual averages are computed, the population size on which that average is based is lost in the average of averages calculation. [log in to unmask] (home) [log in to unmask] (work) > ---------- > From: Bob Anibal[SMTP:[log in to unmask]] > Sent: Friday, September 18, 1998 9:06 AM > To: Multiple recipients of list PARKINSN > Subject: Re: QT: average > > A cardinal rule of statistics as I remember is that the average of the > averages is the average of all. This frequently simplifies > calculations. > Bob Anibal >