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<p>In order to analyze the effects of stress on human performance, we examined baseball players because of the  large body of data and many measures of performance available. Clutch hitting is examined because a baseball player  batting in a clutch situation is analogous to a person who is performing in a stressful situation. The more important, or  clutch, the situation the more stress the player may feel. Statistical measures were used to determine if a player is able  to perform better than his average ability in situations defined as clutch. Three different clutch definitions were used  to examine eight consecutive years of baseball data. Major League Baseball (MLB) data showed an overall clutch  effect; this was corrected for with a parameter, alpha, is specific to the definition of clutch. Once each player's nonclutch  average minus the clutch average is corrected for with alpha, the chi-squared test is used to examine those  differences. This analysis is also performed on the quartile values for batters who were ranked according to their  difference, corrected by alpha. There is no evidence to support the claim that there are certain batters who perform  better in clutch situations (compared to their own performance in non-clutch situations) than other batters.
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<br>Subjects: Baseball; Performance; Stress (Physiology); Stress (Psychology); Psychology, Military; Soldiers; Job stress</div>
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Pauls, Kathleen E.</div>
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