Kappa coefficient calculation using multiple ratings per subject: a special communication
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1Research and Training Center in Rehabilitation and Childhood Trauma, Tufts University School of Medicine, New England Medical Center Hospitals, Boston, MA 02111.
Physical Therapy
|November 1, 1989
Abstract:
The purpose of this special communication is to describe the application of the Kappa coefficient for the estimation of interobserver agreement. Kappa is a preferred statistic for the estimation of the accuracy of nominal and ordinal data in clinical research by physical therapists. A brief introduction to the properties of the Kappa coefficient is given, and a special case of Kappa for multiple ratings per subject is explained. A FORTRAN program, written specifically for the multiple-ratings situation, is described.