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A Device for Facilitating the Computation of the First Four Moments about the Mean

Published online by Cambridge University Press:  01 January 2025

John Lyman  and
Pietro V. Marchetti
John Lyman
Affiliation:
University of California at Los Angeles
Pietro V. Marchetti
Affiliation:
University of Illinois
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Abstract

A mechanical device is described which materially reduces the time, labor, and probability of errors which are involved in the computation of certain moments about the mean. The use of the device is illustrated with the computation of the mean, standard deviation, g1 as a measure of skewness, and g2 as a measure of kurtosis of data from a given study.

Type
Original Paper
Information
Psychometrika , Volume 15 , Issue 1 , March 1950 , pp. 49 - 55
Copyright
Copyright © 1950 The Psychometric Society

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Footnotes

*

Grateful acknowledgment is made to the Holter Research Foundation of Helena, Montana for the grant-in-aid which made possible the development of this device.

References

Kenny, J. F. Mathematics of statistics, New York: D. Van Nostrand, 1939.Google Scholar
McNemar, Q. Psychological statistics, New York: John Wiley & Sons, 1949.Google Scholar