Fit a true mirt mixture-IRT response model — fit_mixture_irt_process

This is distinct from the existing two-stage process-class reference model: the response distribution itself is calibrated using mirt's mixture density. Process features may then be compared with the fitted response classes only when a defensible class-membership extraction is available.

Usage

fit_mixture_irt_process_classes(
  response_matrix,
  n_classes = 2L,
  model = 1,
  itemtype = "2PL",
  SE = FALSE
)

Arguments

response_matrix: Person x item response matrix.
n_classes: Number of mixture classes. The currently verified internal route supports two classes (`mixture-2`).
model: mirt model specification, default one dimension.
itemtype: Item type.
SE: Request standard errors.