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rater provides tools for fitting and interrogating statisticalmodels of repeated categorical rating data. The package provides asimple interface to fit a selection of these models, with arbitraryprior parameters, using MCMC and optimisation provided byStan. A selection of functions are also providedto plot parts of these models and extract key parameters.

library(rater)fit<- rater(anesthesia,"dawid_skene")# Sampling output suppressed.

Get the posterior mean of the “pi” parameter.

point_estimate(fit,"pi")

## $pi## [1] 0.37586040 0.40654649 0.14337154 0.07422156

Plot the accuracy matrices of the raters.

plot(fit,"raters")

rater requires therstan package to fit models. Detailedinstructions to installrstan can be foundhere

Installrater from CRAN with:

install.packages("rater")

To install the development version ofrater from GitHub run:

# install.packages("remotes")remotes::install_github("jeffreypullin/rater")

• When installing from source, i.e. when installing the developmentversion or installing from CRAN on Linux, theStan models in thepackage will be compiled - this will lead to an install time of fewminutes. Please be patient - this compilation means thatnocompilation is required when using the package

• During compilation many warnings may be displayed in the terminal;these are harmless but impossible to suppress.