yield "a conclu-sion based on a much larger sample than any single study." In this way, he contends, the weaknesses of individual stud- ies often will be exposed, and patterns sometimes will appear that were invisible to the origi- nal investigators. "Virtually all studies have flaws or biases," Olkin says, "and it may well be that the only way to ascertain the truth is to search for pat- terns in an aggregate of stud- ies." Call it the Oat Bran Rule.
Global Warming-Just...