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

Oleh:

Ayer, J. Douglas ; Stanley, J. Perham

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 17 no. 3 (Sep. 1952), page 305-310.
Topik: Computing Sums; Sums of Squares; Sums of Cross-Products
Fulltext: VOL. 17, No. 3 Sept 1952 p.305-310.pdf (323.95KB)

Isi artikel

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.

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