, Volume 6, Issue 6, pp 367–374 | Cite as

A simple scoring weight for test items and its reliability

  • J. P. Guilford


It is pointed out that the scoring weights for test items should be approximations to regression-equation weights. For this reason any estimate of reliability of the weight should not be permitted to influence the size of the weight but should be used in determining the limit of acceptability of an item. A simple approximation weight is recommended for general use, and anabac is provided for the estimation of it when the correlation between item and criterion is the phi coefficient. A formula for the standard error of this weight is derived and tables of significant and very significant weights are presented in terms of deviations from the median weight.


Standard Error Public Policy Statistical Theory Test Item Simple Approximation 
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  1. 1.
    Guilford, J. P. The phi coefficient and chi square as indices of item validity.Psychometrika, 1941,6, 11–19.Google Scholar
  2. 2.
    Kelley, T. L. The scoring of alternative responses with reference to some criterion.J. educ. Psychol., 1934,25, 504–510.Google Scholar
  3. 3.
    Kelley, T. L.Statistical Methods. New York: Macmillan Company, 1924.Google Scholar

Copyright information

© Psychometric Society 1941

Authors and Affiliations

  • J. P. Guilford
    • 1
  1. 1.University of Southern CaliforniaUSA

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