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eRm (version 0.15-5)

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-Löf-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

0.15-5

License

GPL-2

Maintainer

Patrick Mair

Last Published

January 10th, 2015

Functions in eRm (0.15-5)

itemfit.ppar

Residuals, Personfit and Itemfit Statistics
print.eRm

Methods for extended Rasch models
collapse_W

Convenient Collapsing of LLRA Design Matrix
LRtest

Computation of Andersen's LR-test.
RSM

Estimation of rating scale models
LRSM

Estimation of linear rating scale models
anova.llra

Analysis of Deviance for Linear Logistic Models with Relaxed Assumptions
Waldtest

Item-Specific Wald Test
eRm-package

extended Rasch modeling
RSmpl

Sample Objects
PCM

Estimation of partial credit models
LLRA

Fit Linear Logistic Models with Relaxed Assumptions (LLRA)
sim.2pl

Simulation of 2-PL Data
RaschSampler

Rasch Sampler Package
llraDat1

An Artificial LLRA Data Set
sim.xdim

Simulation of multidimensional binary data
phi.range

Example User Function
stepwiseIt

Stepwise item elimination
LPCM

Estimation of linear partial credit models
llra.datprep

Prepare Data Set for LLRA Analysis
person.parameter

Estimation of Person Parameters
sim.rasch

Simulation of Rasch homogeneous data
Separation Reliability

Person Separation Reliability
IC

Information criteria
Analysis of Deviances

Analysis of Deviances for Rasch Models
plotPWmap

Pathway Map
plotDIF

Confidence intervals plot of item parameter estimates.
NonparametricTests

A Function to Perform Nonparametric Rasch Model Tests
llradat3

An Artificial LLRA Data Set
MLoef

Martin-Löf's Likelihood-Ratio-Test
summary.llra

Summarizing Linear Logistic Models with Relaxed Assumptions (LLRA)
RSctr

Control Object
item_info

Calculate Item Information for 'eRm' objects
rsextrmat

Extracting a Matrix
test_info

Calculate Test Information For eRm objects
rstats

Calculating Statistics for the Sampled Matrices
thresholds

Computation of item-category treshold parameters.
plotTR

Plot Trend Effects for LLRA
plotPImap

Person-Item Map
rsextrobj

Extracting Encoded Sample Matrices
rsampler

Sampling Binary Matrices
build_W

Automatized Construction of LLRA Design Matrix
LLTM

Estimation of linear logistic test models
gofIRT

Various model tests and fit indices
RM

Estimation of Rasch Models
rsctrl

Controls for the Sampling Function
plotINFO

Plot Information For 'eRm' objects
predict.ppar

Predict methods
plotICC

ICC Plots
plotGR

Plot Treatment or Covariate Effects for LLRA
sim.locdep

Simulation locally dependent items
summary.RSctr

Summary Method for Control Objects
xmpl

Example Data
summary.RSmpl

Summary Methods for Sample Objects
llraDat2

An Artificial LLRA Data Set
eRm.data

Data for Computing Extended Rasch Models