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The Rolling Totals Method of Computing Sums, Sums of Squares, and Sums of Cross-Products

Published online by Cambridge University Press:  01 January 2025

J. Douglas Ayers  and
J. Perham Stanley
J. Douglas Ayers
Affiliation:
Defence Research Medical Laboratories
J. Perham Stanley
Affiliation:
Abitibi Power and Paper Company
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Abstract

The rolling totals method of computing sums, sums of squares, and sums of cross-products appears to have several advantages over usual methods, in that it saves time and requires less equipment. Only an IBM sorter and a tabulator equipped with Card Cycle Total Transfer Device are used. The method provides an immediate independent visual check on the accuracy of the sums of cross-products of each successive variable as it is run. Since controlling is done by sorting, the necessity for re-wiring after each run on the tabulator is eliminated. The wiring, illustrated by a diagram, is simple and straightforward.

Type
Original Paper
Information
Psychometrika , Volume 17 , Issue 3 , September 1952 , pp. 305 - 310
Copyright
Copyright © 1952 The Psychometric Society

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References

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