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Parameters of the Menstrual Cycle: A Reply

Robert G. Potter, Jr.
Population Studies
Vol. 20, No. 2 (Nov., 1966), pp. 223-232
DOI: 10.2307/2172983
Stable URL: http://www.jstor.org/stable/2172983
Page Count: 10
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Parameters of the Menstrual Cycle: A Reply
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Abstract

In a set of two papers, one of them published in this journal in July 1965, W. H. James defends the menstrual statistics of E. J. Farris and his co-workers and exploits these data to propose a new formula of calendar rhythm that allegedly provides maximum protection for a given amount of abstinence. The present paper argues that Farris's data are open to a suspicion of serious bias. James's estimates of various parameters of the menstrual cycle are questioned mainly on grounds of deficient data. However, it is concluded that his methods of estimation will prove useful in future analyses of menstrual variation.

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