The goal of compicc is to help practicioners in fields such as psychology, medicine and sports performance science to compare the reliability of two raters (or systems, instruments or judges). This package includes two functions that allow the user to compute the difference between the intraclass correlation coefficient of measurements in two datasets. For example, one may compare the reliability of measurements from two different raters (or measurement instruments) or one rater at two different time points.


You may install the released version of compicc from CRAN with:


The development version from GitHub is available with:

# install.packages("devtools")


This package includes two functions:

The package includes example data to illustrate both functions. Details are given in the vignette. The vignette also explains possible user errors, typically due to incorrect formatting of the data, and reviews both functions’ error messages.