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Science 24 October 1986:
Vol. 234. no. 4775, p. 413
DOI: 10.1126/science.234.4775.413
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Erratum

The Research News article "How unusual are unusual events?" by Roger Lewin (26 Sept., p. 1385) cited the statement "Given a 5% probability of an unusual event in a 1-year study, one should expect a 35% probability of such an event in a 7-year study." The expected correct probability for a 7-year study would be 30.17%.

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