References
Anderson, J. E. The limitations of infant and preschool tests in the measurement of intelligence.J. Psychol., 1939,8, 351–379.
DuBois, P. H. An analysis of Guttman's simplex.Psychometrika, 1960,25, 173–182.
Fleishman, E. A. and Hempel, W. E., Jr. Changes in factor structure of a complex psychomotor test as a function of practice.Psychometrika, 1954,19, 239–252.
Fleishman, E. A. and Hempel, W. E., Jr. The relation between abilities and improvement with practice in a visual discrimination reaction task.J. exp. Psychol., 1955,49, 301–316.
Guttman, L. A generalized simplex for factor analysis.Psychometrika, 1955,20, 173–192.
Spence, K. W. The nature of theory construction in contemporary psychology.Psychol. Rev., 1944,51, 47–68.
Author information
Authors and Affiliations
Additional information
Presidential address delivered to the Psychometric Society, Chicago, Illinois, September 6, 1960.
The research on which this paper is based was supported in part by the University Research Board of the University of Illinois and, the larger part by the National Institute of Mental Health.
Rights and permissions
About this article
Cite this article
Humphreys, L.G. Investigations of the simplex. Psychometrika 25, 313–323 (1960). https://doi.org/10.1007/BF02289750
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02289750