Plot Raw Values, Moving Average, and Monotonized Moving Average

Visualizes the IDM rating process for each rater, showing raw ratings, smoothed moving averages, and the final isotonic regression line used to determine cut scores.

Usage

plotCutsIDM(res_list, est_col = NULL)

Arguments

res_list

A list returned by computeCutsIDM() containing the processed data and cut score coordinates.

est_col

Optional character scalar. Label to use for the item difficulty axis. If NULL, the value stored by computeCutsIDM() is used.

Details

One main idea of the IDM method is to account for rater noise by smoothing and monotonizing the relationship between item difficulty and the assigned levels. Blue lines represent the moving average, while red lines represent the monotonized curve used to find the vertical intercepts.

Value

A ggplot2 object.

Author

Karoline Sachse

Examples

# res <- computeCutsIDM(my_data)
# plotCutsIDM(res)