, Volume 44, Issue 4, pp 461–472

Ramifications of a population model forκ as a coefficient of reliability

  • Helena Chmura Kraemer

DOI: 10.1007/BF02296208

Cite this article as:
Kraemer, H.C. Psychometrika (1979) 44: 461. doi:10.1007/BF02296208


Coefficientκ is generally defined in terms of procedures of computation rather than in terms of a population. Here a population definition is proposed. On this basis, the interpretation ofκ as a measure of diagnostic reliability in characterizing an individual, and the effect of reliability, as measured byκ, on estimation bias, precision, and test power are examined. Factors influencing the magnitude ofκ are identified. Strategies to improve reliability are proposed, including that of combining multiple unreliable diagnoses.

Key words

kappareliabilitySpearman-Brown formula

Copyright information

© The Psychometric Society 1979

Authors and Affiliations

  • Helena Chmura Kraemer
    • 1
  1. 1.Department of Psychiatry and Behavioral SciencesStanford UniversityStanford