confint: S3 Methods: confint

In ForceChoice: Forced-Choice Modeling Based on Item Response Theory and Cognitive Diagnostic Models

S3 Methods: confint

Description

Computes Wald-type confidence intervals for the model parameters of a fitted ForceChoice model object. Intervals are constructed as \hat{\psi}_k \pm z_{1-\alpha/2}\,\mathrm{SE}_k, where \hat{\psi}_k is the point estimate and \mathrm{SE}_k is the standard error of the k-th free parameter.

Usage

## S3 method for class 'MIRT'
confint(object, parm = NULL, level = 0.95, ...)

## S3 method for class 'MGPCM'
confint(object, parm = NULL, level = 0.95, ...)

## S3 method for class 'MGGUM'
confint(object, parm = NULL, level = 0.95, ...)

## S3 method for class 'FCMIRT'
confint(object, parm = NULL, level = 0.95, ...)

## S3 method for class 'FCDCM'
confint(object, parm = NULL, level = 0.95, ...)

## S3 method for class 'FCGDINA'
confint(object, parm = NULL, level = 0.95, ...)

## S3 method for class 'FCGGUM'
confint(object, parm = NULL, level = 0.95, ...)

## S3 method for class 'TIRT'
confint(object, parm = NULL, level = 0.95, ...)

Arguments

object	A fitted model object.
parm	Optional numeric indices or character names selecting free parameters. By default, intervals are returned for all free parameters.
level	Numeric; confidence level (default: 0.95 for 95% intervals).
...	Additional arguments (currently ignored).

Value

A numeric matrix with two columns, 2.5% and 97.5% (column names adjust automatically for non-default level). Each row corresponds to one free parameter.

Methods (by class)

• confint(MIRT): Confidence intervals for MIRT parameters.

• confint(MGPCM): Confidence intervals for MGPCM parameters.

• confint(MGGUM): Confidence intervals for MGGUM parameters.

• confint(FCMIRT): Confidence intervals for FCMIRT parameters.

• confint(FCDCM): Confidence intervals for FCDCM parameters.

• confint(FCGDINA): Confidence intervals for FCGDINA parameters.

• confint(FCGGUM): Confidence intervals for FCGGUM parameters.

• confint(TIRT): Confidence intervals for TIRT parameters.

ForceChoice documentation built on Sept. 13, 2026, 1:06 a.m.