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In [[statistics]], the '''interclass correlation''' (or ''interclass correlation coefficient'') measures athe relationrelationship between two variables of different classes (types), such as the weights of 10-year-old sons and the weights of their 40-year-old fathers. Deviations offor aeach variable are measuredcalculated from the [[mean]] of thetheir datarespective forclasses that– class –specifically, a son’sson's weight minus the mean weight of all the sons’ weightssons, or a father’sfather's weight minus the mean weight of all the fathers’ weightsfathers.
The [[Pearson correlation coefficient]] is the most commonly used measure of interclass correlation.
The interclass correlation contrastsdiffers with thefrom [[intraclass correlation|''intra''class correlation]], which betweeninvolves variables of the same class, such as the weights of women and of their identical twins;. hereIn this case, deviations are measured from the mean of all members of the single class:, insuch this example ofas all women inwithin the set of identical twins.
