Learn R Programming
⚠️There's a newer version (1.0-9) of this package.Take me there.

eRm (version 0.15-3)

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).

Copy Link

Version

Install

install.packages('eRm')

Monthly Downloads

2,256

Version

0.15-3

License

GPL-2

Maintainer

Patrick Mair

Last Published

December 7th, 2013

Functions in eRm (0.15-3)

anova.llra

Analysis of Deviance for Linear Logistic Models with Relaxed Assumptions
RSM

Estimation of rating scale models
plotINFO

Plot Information For 'eRm' objects
IC

Information criteria
xmpl

Example Data
predict.ppar

Predict methods
rsextrobj

Extracting Encoded Sample Matrices
LLRA

Fit Linear Logistic Models with Relaxed Assumptions (LLRA)
llradat3

An Artifical LLRA Data Set
test_info

Calculate Test Information For 'eRm' objects
llraDat2

An Artifical LLRA Data Set
gofIRT

Various model tests and fit indices
Waldtest

Item-Specific Wald Test
RSctr

Control Object
sim.locdep

Simulation locally dependent items
LRtest

Computation of Andersen's LR-test.
RaschSampler

Rasch Sampler Package
llra.datprep

Prepare Data Set for LLRA Analysis
LLTM

Estimation of linear logistic test models
rsctrl

Controls for the Sampling Function
LPCM

Estimation of linear partial credit models
llraDat1

An Artifical LLRA Data Set
plotICC

ICC Plots
summary.RSctr

Summary Method for Control Objects
eRm-package

extended Rasch modeling
MLoef

Computation of Martin-Loef's LR-Test
build_W

Automatized Construction of LLRA Design Matrix
sim.rasch

Simulation of Rasch homogeneous data
plotGR

Plot Treatment or Covariate Effects for LLRA
summary.RSmpl

Summary Methods for Sample Objects
plotPWmap

Pathway Map
item_info

Calculate Item Information for 'eRm' objects
NPtest

function to perform nonparametric Rasch model tests
person.parameter

Estimation of Person Parameters
sim.2pl

Simulation of 2-pl data
plotTR

Plot Trend Effects for LLRA
collapse_W

Convenient Collapsing of LLRA Design Matrix
LRSM

Estimation of linear rating scale models
rstats

Calculating Statistics for the Sampled Matrices
rsextrmat

Extracting a Matrix
PCM

Estimation of partial credit models
stepwiseIt

Stepwise item elimination
sim.xdim

Simulation of multidimensional binary data
RSmpl

Sample Objects
eRm.data

Data for Computing Extended Rasch Models
phi.range

Example User Function
summary.llra

Summarizing Linear Logistic Models with Relaxed Assumptions (LLRA)
thresholds

Computation of item-category treshold parameters.
plotPImap

Person-Item Map
print.eRm

Methods for extended Rasch models
rsampler

Sampling Binary Matrices
plotDIF

Confidence intervals plot of item parameter estimates.
RM

Estimation of Rasch Models
itemfit.ppar

Residuals, Personfit and Itemfit Statistics