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(
  dfin,
  output = "table",
  fontsize = 15,
  maxiter = 5000,
  rotation = "oblimin"
)

Arguments

output

Optional "dataframe" or "quarto"

fontsize

Set font size

maxiter

Maximum number of iterations. Increase if convergence not obtained.

rotation

Defaults to "oblimin"

data

Dataframe with item data only

Details

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