generate_tirt_mplus_syntax: Generate Mplus Syntax for Thurstonian IRT (TIRT) or...

In autoFC: Automatic Toolkit for Construction, Optimization, Scoring and Simulation of Forced-Choice Tests

Generate Mplus Syntax for Thurstonian IRT (TIRT) or Thurstonian Factor Model (TFM)

Description

Generate Mplus Syntax for Thurstonian IRT (TIRT) or Thurstonian Factor Model (TFM)

Usage

generate_tirt_mplus_syntax(
  title = "TIRT Model",
  data_file,
  n_blocks,
  block_size,
  key_matrix,
  trait_col,
  key_col,
  cor_matrix = NULL,
  model_type = c("TIRT", "TFM"),
  tfm_free_pair_residuals = TRUE,
  estimator = c("WLSMV", "ULSMV", "ULS"),
  missing_code = "*",
  force_positive_variances = TRUE,
  quick_run = FALSE,
  out_file = "tirt_model.inp"
)

Arguments

title	Character. Title of the Mplus model.
data_file	Character. Name of the input data file.
n_blocks	Integer. Number of blocks in the questionnaire.
block_size	Integer. Number of items per block.
key_matrix	A data.frame indicating item trait and item sign.
trait_col	Character string. The name of the column in key_matrix indicating the trait measured by the item.
key_col	Character string. The name of the column in key_matrix indicating the keying direction of the item (e.g., positive/negative).
cor_matrix	Optional matrix. Starting values for trait correlations.
model_type	Character. Choose "TIRT" for the First-Order parameterization or "TFM" for the Second-Order parameterization.
tfm_free_pair_residuals	Logical. In the TFM model, should the residual variance of the observed pairs be freely estimated? Defaults to TRUE.
estimator	Character. The Mplus estimator to use ("WLSMV", "ULSMV", "ULS").
missing_code	Numeric or Character. The value representing missing data.
force_positive_variances	Logical. Constrain residual variances to be strictly positive (> 0.001/0) to prevent Heywood cases. Defaults to TRUE.
quick_run	Logical. Specify TRUE to speed up estimation by not producing Chi-Square and standard errors. Defaults to FALSE.
out_file	Character. The filename to save the generated Mplus syntax.

autoFC documentation built on July 14, 2026, 5:07 p.m.