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1944 Factor rotation machine

Author: Harry Harmon (1913-1976)

Development of an electro-mechanical machine to aid in the rotation of multidimensional factor analysis solutions to "simple structure.'' This allowed an analyst to carry out by direct manipulation of dials what one did by plotting pairs of factors, and hand calculation of the rotation matrices in earlier times [(work carried out under the Adjutant General for development of the Armed Forces General Classification Test) cite{Tucker:2002}]

Category: Technology

This web version is dedicated to Arthur H. Robinson (1915-2004), who inspired and encouraged our interest; to Antoine de Falguerolles, who initiated it, and to les Chevaliers des Album de Statistique Graphique, who supported it with interest, enthusiasm, and resources. In particular, Gilles Palsky, Antoine de Falguerolles, Antony Unwin and Ruddy Ostermann contributed important images and background information. This work is supported by the National Sciences and Engineering Research Council of Canada, Grant OGP0138748.

Citations: References to information or images obtained from this web site should be cited as follows:
Friendly, M. & Denis, D. J. (2001). Milestones in the history of thematic cartography, statistical graphics, and data visualization. Web document, http://www.datavis.ca/milestones/. Accessed:

Copyright © 2001-2018 Michael Friendly
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