gpcm_IMT: Runs the GPCM model for use in the Information Matrix Test.

In IMTest: Information Matrix Test for Generalized Partial Credit Models

Description

Runs the GPCM model for use in the Information Matrix Test.

Usage

gpcm_IMT(data, constraint = c("gpcm", "1PL", "rasch"), IRT.param = TRUE,
  start.val = NULL, na.action = NULL, control = list())

Arguments

data	A dataset with J columns and n rows.
constraint	Constraint is either "1PL", "rasch" or "gpcm" depending on which parameter constraints should be run.
IRT.param	logical; if TRUE then the usual IRT parametrization is used.
start.val	If not Null, a list of starting values for the parameter estimates
na.action	the na.action to be used on the data
control	See gpcm function in ltm package for details.

Value

A GPCM object.

Examples

data(dataset)
model = gpcm_IMT(dataset, constraint = "rasch")
# See vignette("IMT-vignette") for more examples

IMTest documentation built on May 1, 2019, 9:06 p.m.