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An Abac for Determining the Mean Deviation of a Class from the General Mean

Published online by Cambridge University Press:  01 January 2025

Jack W. Dunlap
Jack W. Dunlap*
Affiliation:
University of Rochester and Salvatore Di Michael, New York City
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Abstract

The abac is presented with instructions for use.

Type
Original Paper
Information
Psychometrika , Volume 3 , Issue 1 , March 1938 , pp. 41 - 44
Copyright
Copyright © 1938 The Psychometric Society

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References

* Likert reports values of —.43 and 1.76 which are slightly in error.