rater provides tools for fitting and interrogating statistical models of repeated categorical rating data. The package provides a simple interface to fit a selection of these models, with arbitrary prior parameters, using MCMC and optimisation provided by Stan. A selection of functions are also provided to plot parts of these models and extract key parameters.

## Example usage:

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")

## Installation

rater requires the rstan package to fit models. Detailed instructions to install rstan can be found here

### CRAN

Install rater from CRAN with:

install.packages("rater")

### Development

To install the development version of rater from GitHub run:

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

#### Installation notes:

• When installing from source, i.e. when installing the development version or installing from CRAN on Linux, the Stan models in the package will be compiled - this will lead to an install time of few minutes. Please be patient - this compilation means that no compilation is required when using the package

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