Equate Scores Between Tests using Leunbach Model — leunbach_equate • leunbachR

Creates equating tables to convert scores from one test to another using the estimated score parameters from the Leunbach model.

Usage

leunbach_equate(
  fit,
  direction = c("1to2", "2to1"),
  method = c("optimize", "newton"),
  verbose = FALSE
)

Arguments

fit: A leunbach_ipf object from leunbach_ipf()
direction: Direction of equating: "1to2" (Test1 to Test2) or "2to1" (Test2 to Test1)
method: Optimization method for person parameter estimation: "optimize" (default) uses stats::optimize() with Brent's method, "newton" uses custom Newton-Raphson with bisection fallback
verbose: Print detailed output

Value

A list of class "leunbach_equating" containing:

equating_table: Data frame with original scores, theta, expected equated scores, and rounded scores
direction: Direction of equating
method: Optimization method used
fit: Original leunbach_ipf object