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eRm (version 0.15-4)

Extended Rasch Modeling

Description

eRm fits Rasch models (RM), linear logistic test models (LLTM), rating scale model (RSM), linear rating scale models (LRSM), partial credit models (PCM), and linear partial credit models (LPCM). Missing values are allowed in the data matrix. Additional features are the ML estimation of the person parameters, Andersen's LR-test, item-specific Wald test, Martin-Loef-Test, nonparametric Monte-Carlo Tests, itemfit and personfit statistics including infit and outfit measures, various ICC and related plots, automated stepwise item elimination, simulation module for various binary data matrices. An eRm platform is provided at R-forge (see URL).

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Version

Install

install.packages('eRm')

Monthly Downloads

2,256

Version

0.15-4

License

GPL-2

Maintainer

Patrick Mair

Last Published

February 5th, 2014

Functions in eRm (0.15-4)

RSctr

Control Object
anova.llra

Analysis of Deviance for Linear Logistic Models with Relaxed Assumptions
RM

Estimation of Rasch Models
RaschSampler

Rasch Sampler Package
thresholds

Computation of item-category treshold parameters.
sim.locdep

Simulation locally dependent items
build_W

Automatized Construction of LLRA Design Matrix
llraDat2

An Artifical LLRA Data Set
sim.2pl

Simulation of 2-pl data
phi.range

Example User Function
xmpl

Example Data
sim.rasch

Simulation of Rasch homogeneous data
plotPImap

Person-Item Map
rstats

Calculating Statistics for the Sampled Matrices
person.parameter

Estimation of Person Parameters
plotICC

ICC Plots
RSM

Estimation of rating scale models
item_info

Calculate Item Information for 'eRm' objects
llra.datprep

Prepare Data Set for LLRA Analysis
gofIRT

Various model tests and fit indices
LPCM

Estimation of linear partial credit models
summary.RSmpl

Summary Methods for Sample Objects
plotTR

Plot Trend Effects for LLRA
LRSM

Estimation of linear rating scale models
rsextrobj

Extracting Encoded Sample Matrices
plotGR

Plot Treatment or Covariate Effects for LLRA
eRm-package

extended Rasch modeling
stepwiseIt

Stepwise item elimination
Waldtest

Item-Specific Wald Test
LLRA

Fit Linear Logistic Models with Relaxed Assumptions (LLRA)
rsctrl

Controls for the Sampling Function
print.eRm

Methods for extended Rasch models
NPtest

function to perform nonparametric Rasch model tests
itemfit.ppar

Residuals, Personfit and Itemfit Statistics
summary.RSctr

Summary Method for Control Objects
summary.llra

Summarizing Linear Logistic Models with Relaxed Assumptions (LLRA)
PCM

Estimation of partial credit models
IC

Information criteria
RSmpl

Sample Objects
plotDIF

Confidence intervals plot of item parameter estimates.
predict.ppar

Predict methods
plotPWmap

Pathway Map
eRm.data

Data for Computing Extended Rasch Models
LRtest

Computation of Andersen's LR-test.
LLTM

Estimation of linear logistic test models
plotINFO

Plot Information For 'eRm' objects
rsampler

Sampling Binary Matrices
test_info

Calculate Test Information For 'eRm' objects
sim.xdim

Simulation of multidimensional binary data
rsextrmat

Extracting a Matrix
collapse_W

Convenient Collapsing of LLRA Design Matrix
llradat3

An Artifical LLRA Data Set
llraDat1

An Artifical LLRA Data Set
MLoef

Computation of Martin-Loef's LR-Test