![]() The most popular chance-adjusted indices, according to a functionalist view of mathematical statistics, assume that all raters conduct intentional and maximum random rating while typical raters conduct involuntary and reluctant random rating. The experts also disagree on which of the three factors, rating category, distribution skew, or task difficulty, an index should rely on to estimate chance agreement, or which factors the known indices in fact rely on. The experts, however, disagree on which chance estimators are legitimate or better. While numerous indices of interrater reliability are available, experts disagree on which ones are legitimate or more appropriate.Īlmost all agree that percent agreement (a o), the oldest and the simplest index, is also the most flawed because it fails to estimate and remove chance agreement, which is produced by raters’ random rating. It is used across many disciplines including medical and health research to measure the quality of ratings, coding, diagnoses, or other observations and judgements. Interrater reliability, aka intercoder reliability, is defined as true agreement between raters, aka coders, without chance agreement. ![]()
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