Psychometrika

, Volume 11, Issue 2, pp 81–95

The test-retest reliability of qualitative data

  • Louis Guttman
Article

DOI: 10.1007/BF02288925

Cite this article as:
Guttman, L. Psychometrika (1946) 11: 81. doi:10.1007/BF02288925

Abstract

The test-retest reliability of qualitative items, such as occur in achievement tests, attitude questionnaires, public opinion surveys, and elsewhere, requires a different technique of analysis from that of quantitative variables. Definitions appropriate to the qualitative case are made both for the reliability coefficient of an individual on an item and for the reliability coefficient of a population on the item. From but a single trial of a large population on the item, it is possible to compute alower bound to the group reliability coefficient. Two kinds of lower bounds are presented. From two experimentally independent trials of the population on the item, it is possible to compute anupper bound to the group reliability coefficient. Two upper bounds are presented. The computations for the lower and upper bounds are all very simple. Numerical examples are given.

Copyright information

© Psychometric Society 1946

Authors and Affiliations

  • Louis Guttman
    • 1
  1. 1.Cornell UniversityUSA