Relying on averages, for anything, is a sure-fire method to cover up little differences that might have big meaning. An average removes the most interesting data from the discussion.
Don’t you want to know who is best, and who is worst, at something? Averages disguise this. Don’t you want to know what accounts for outlier performance, on either end? Averages cover this up.
Author: Sydney Finkelstein
Source: The Conference Board Review
Subjects: Management, Measurement