This is an extended version of a paper presented to the Methodology Section of the American Sociological Association at the 1973 annual meeting in New York. The author is indebted to David R. Heise, Herbert L. Costner, Arthur S. Goldberger, Hubert M. Blalock, and Lois MacGillivray for their critical and constructive comments on earlier versions of this paper. Any errors, of course, are the sole responsibility of the author.
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Michael P. Allen (1973) studied this question.
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