From Knowledge@Wharton (April 2), a discussion of work by Wharton researchers on the use of statistics in the report defending Major League Baseball player Roger Clemens:
"By comparing Clemens only to those who were successful in the second act of their careers, rather than to all pitchers who had a similarly successful first act, the report artificially minimizes the chances that Clemens' numbers will seem unusual," they write. "Statisticians call this problem 'selection bias.'"
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