• 1 January 1979
    • journal article
    • review article
    • Vol. 83  (5) , 460-472
Abstract
Indices [16] of interobserver [human] agreement and methods [6] for estimating coefficients of interobserver reliability were critiqued. The agreement statistics were imprecise, limited psychometrically and relatively inflexible in terms of the diverse categorical and quantitative data sets typically encountered in mental retardation research. Of the reliability statistics 5 produced precise estimates of agreement, yet possessed similar limitations. Only the intraclass correlation-generalizability theory approach seemed to offer the precision, comprehensiveness and flexibility required to deal with the complexity of reliability assessment. A basic generalizability model was described and illustrated with group and single-subject research data.

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