Calculation in Software Packages
ICC is supported by the R software package (using the icc command with packages psy, psych or irr). Non-free software also supports ICC, for instance SPSS
| Shrout and Fleiss convention | Name in SPSS |
|---|---|
| ICC(1,1) | One-way random single measures |
| ICC(1,k) | One-way random average measures |
| ICC(2,1) | Two-way random single measures (Consistency/Absolute agreement) |
| ICC(2,k) | Two-way random average measures (Consistency/Absolute agreement) |
| ICC(3,1) | Two-way mixed single measures (Consistency/Absolute agreement) |
| ICC(3,k) | Two-way mixed average measures (Consistency/Absolute agreement) |
Read more about this topic: Intraclass Correlation
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“Common sense is the measure of the possible; it is composed of experience and prevision; it is calculation appled to life.”
—Henri-Frédéric Amiel (1821–1881)