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J Appl Behav Anal. 1977 Spring; 10(1): 103–116.
PMCID: PMC1311156

Considerations in the choice of interobserver reliability estimates


Two types of interobserver reliability values may be needed in treatment studies in which observers constitute the primary data-acquisition system: trial reliability and the reliability of the composite unit or score which is subsequently analyzed, e.g., daily or weekly session totals. Two approaches to determining interobserver reliability are described: percentage agreement and “correlational” measures of reliability. The interpretation of these estimates, factors affecting their magnitude, and the advantages and limitations of each approach are presented.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Fleiss JL. Measuring agreement between two judges on the presence or absence of a trait. Biometrics. 1975 Sep;31(3):651–659. [PubMed]
  • Kazdin AE, Klock J. The effect of nonverbal teacher approval on student attentive behavior. J Appl Behav Anal. 1973 Winter;6(4):643–654. [PMC free article] [PubMed]
  • Schmidt GW, Ulrich RE. Effects of group contingent events upon classroom noise. J Appl Behav Anal. 1969 Fall;2(3):171–179. [PMC free article] [PubMed]
  • Wahler RG. Some structural aspects of deviant child behavior. J Appl Behav Anal. 1975 Spring;8(1):27–42. [PMC free article] [PubMed]

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