818
TURNER
because of poor counting statistics, the resulting bias could influence
the form of reported distributions. No effort has been madein this
paper to evaluate the possible role of errors in determining the shape
of frequency distributions.
ACKNOWLEDGMENTS
It is a pleasure to acknowledge the generous assistance of Robert
I. Jennrich, Department of Preventive Medicine and Public Health,
University of California at Los Angeles, in the preparation of this
paper.
Thanks are also due to Evelyn Read, who programmedthe
probabilistic model for computer solution. Appreciation is expressed
for the excellent assistance of Richard H. Rowland and Bruce W.
Kowalewsky in data reduction and analysis. Finally, the helpful comments and criticisms of Thomas G. Hennessy, William A. Rhoads,
Norman S. MacDonald, William E. Martin, and Lee L. Eberhardt are
gratefully acknowledged.
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