extract.item

mirt model of class 'ExploratoryClass',
  'ConfirmatoryClass', or 'MultipleGroupClass'

a number or character signifying which item
  to extract

item

a number signifying which group the item
  should be extracted from (applies to 'MultipleGroupClass'
  only)

group

logical; drop slope values that are
  numerically close to zero to reduce dimensionality?
  Useful in objects returned from <code><a href="/link/bfactor?package=mirt&version=1.3" rd-options="" data-mini-rdoc="mirt::bfactor">bfactor</a></code> or
  other confirmatory models that contain several zero
  slopes

drop.zeros

Extract the internal mirt objects from any estimated model.

extract

Analysis of dichotomous and polytomous response data using
    unidimensional and multidimensional latent trait models under the Item
    Response Theory paradigm. Exploratory and confirmatory models can be
    estimated with quadrature (EM) or stochastic (MHRM) methods. Confirmatory
    bi-factor and two-tier analyses are available for modeling item testlets.
    Multiple group analysis and mixed effects designs also are available for
    detecting differential item functioning and modelling item and person
    covariates.

extract.item: Extract an item object from mirt objects

Description

Usage

Arguments

Examples