This article examines the theory of biorhythms and indicates that it is possible that the success of the theory depends upon selective use of confirming data. The theory is examined by using three separate data sets: 727 deaths, 319 marriages, and data from students who kept track of their feelings and abilities for a period of time, one group having a biorhythm to follow and the other not knowing about the theory. None of the data sets provided confirmation of the theory. The theory appears to support the self-fulfilling prophecy, and not the notion of biorhythm.
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References
1.
WardR. R., The Living Clocks, Alfred A. Knopf, New York, 1971.
