gpcm_IMT {IMTest}

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

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