An I.B.M. Technique for The Computation of SX 2 and SXY  

Oleh:

Benjamin, Kurt

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 10 no. 1 (Mar. 1945), page 61-67.
Topik: I.B.M. Technique; Computation; Necessary Equipment; Machine Principle
Fulltext: An I.B.M. Technique for The Computation of SX 2 and SXY.pdf (299.83KB)

Isi artikel

Given I.B.M. cards punched with scores (or any numbers)—but not their squares—a method is presented of tabulating them (on the No. 405 alphameric I.B.M. tabulator) so as to obtain the sum of squares. The technique is also adaptable to summation of cross-products. The principle is an extension of the Mendenhall-Warren-Hollerith technique of vertical progressive digiting, without the necessity of manual addition or summary-punching, and is designed for machines not equipped with the “card cycle total transfer” device or “progressive total” device. Use is made of “counter rolling.” Efficient use of machine capacity is made only when intercorrelations between no more than two variables are requiredin addition to sums of squares. A resumé of some techniques now commonly employed is included.

Opini Anda

Klik untuk menuliskan opini Anda tentang koleksi ini!

Kembali