What is intraclass correlation (ICC)?

A measure of reliability or consistency of measurements within groups (e.g. raters or repeated measures). It is a type of ANOVA-based correlation.

In psychology, medicine, and education to assess agreement or reliability of measurements (e.g. inter-rater reliability).

Anova Intraclass Correlation Icc Calculator

Anova Intraclass Correlation Icc - Solve mathematical problems with step-by-step solutions.

Intraclass Correlation Coefficient

Enter values from your ANOVA table:

Mean Square (Subjects)

MSR

Mean Square (Raters)

MSC

Mean Square (Error)

MSE

Number of Subjects

Number of Raters

ICC quantifies reliability by comparing within-group and between-group variability in ANOVA frameworks.

ICC = variance_between / (variance_between + variance_within)

If between-group variance is 0.8 and within-group is 0.2, ICC = 0.8/(0.8+0.2) = 0.8.

Models?
ICC types (one-way, two-way, consistency/absolute) depend on design assumptions.

Interpretation?
Values closer to 1 indicate higher reliability.

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