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The intraclass correlation coefficient (ICC) measures the correlation of responses within class when responses are grouped into classes or groups, and there are a number of classes or groups. The ICC quantifies the variation between the clusters and can be defined as a proportion of total variation that is attributed to differences between the clusters (groups). Variation of a quantity is spread around its mean measured mainly by variance and standard deviation. Many situations in decision-making science make use of the ICC for drawing inference and assessing reliability. The ICC is used in a variety of situations for different purposes, including assessing homogeneity of outcomes or responses within a class or cluster in the context of a cluster survey, group randomized trial and multilevel studies, ...

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