Fits the Rasch model for dichotomous data using eRm::RM(), and conducts a PCA of residuals to get eigenvalues.

See ?RIpcmPCA for more details.

Usage

RIrmPCA(data, output = "table", fontsize = 15)

Arguments

data

Dataframe with item data only

output

Optional "dataframe" or "quarto"

fontsize

Set font size

Details

See Chou & Wang (2010, DOI: 10.1177/0013164410379322) for a simulation study testing PCA eigenvalues across multiple conditions.