# Psychometric Modeling Infrastructure

## Documentation for package ‘psychotools’ version 0.7-3

- DESCRIPTION file.
- User guides, package vignettes and other documentation.
- Code demos. Use demo() to run them.
- Package NEWS.

## Help Pages

A B C D E F G I L M N P R S T U V W X Y misc

## -- A --

anchor | Anchor Methods for the Detection of Uniform DIF the Rasch Model
anchor.default | Anchor Methods for the Detection of Uniform DIF the Rasch Model
anchor.formula | Anchor Methods for the Detection of Uniform DIF the Rasch Model
anchortest | Anchor methods for the detection of uniform DIF in the Rasch model
anchortest.default | Anchor methods for the detection of uniform DIF in the Rasch model
anchortest.formula | Anchor methods for the detection of uniform DIF in the Rasch model
as.character.itemresp | Coercing Item Response Data
as.character.paircomp | Data Structure for Paired Comparisons
as.data.frame.itemresp | Coercing Item Response Data
as.data.frame.paircomp | Data Structure for Paired Comparisons
as.double.itemresp | Coercing Item Response Data
as.double.paircomp | Data Structure for Paired Comparisons
as.integer.itemresp | Coercing Item Response Data
as.integer.paircomp | Data Structure for Paired Comparisons
as.list.itemresp | Coercing Item Response Data
as.matrix.itemresp | Coercing Item Response Data
as.matrix.paircomp | Data Structure for Paired Comparisons

## -- B --

bread.gpcmodel | Generalized Partial Credit Model Fitting Function
bread.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
bread.pcmodel | Partial Credit Model Fitting Function
bread.raschmodel | Rasch Model Fitting Function
bread.rsmodel | Rating Scale Model Fitting Function
btmodel | Bradley-Terry Model Fitting Function
btReg.fit | Bradley-Terry Model Fitting Function

## -- C --

c.itemresp | Subsetting Item Response Data
c.paircomp | Data Structure for Paired Comparisons
coef.btmodel | Bradley-Terry Model Fitting Function
coef.discrpar | Extract Discrimination Parameters of Item Response Models
coef.gpcmodel | Generalized Partial Credit Model Fitting Function
coef.guesspar | Extract Guessing Parameters of Item Response Models
coef.itempar | Extract Item Parameters of Item Response Models
coef.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
coef.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
coef.pcmodel | Partial Credit Model Fitting Function
coef.personpar | Extract Person Parameters of Item Response Models
coef.raschmodel | Rasch Model Fitting Function
coef.rsmodel | Rating Scale Model Fitting Function
coef.threshpar | Extract Threshold Parameters of Item Response Models
coef.upperpar | Extract Upper Asymptote Parameters of Item Response Models
confint.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
confint.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
ConspiracistBeliefs2016 | Generic Conspiracist Beliefs Scale (2016 Data)
covariates | Extract/Set Covariates
covariates.paircomp | Data Structure for Paired Comparisons
covariates<- | Extract/Set Covariates
covariates<-.paircomp | Data Structure for Paired Comparisons
curveplot | Response Curve Plots for IRT Models

## -- D --

deviance.btmodel | Bradley-Terry Model Fitting Function
deviance.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
discrpar | Extract Discrimination Parameters of Item Response Models
discrpar.gpcmodel | Extract Discrimination Parameters of Item Response Models
discrpar.nplmodel | Extract Discrimination Parameters of Item Response Models
discrpar.pcmodel | Extract Discrimination Parameters of Item Response Models
discrpar.raschmodel | Extract Discrimination Parameters of Item Response Models
discrpar.rsmodel | Extract Discrimination Parameters of Item Response Models

## -- E --

elementary_symmetric_functions | Calculation of the Elementary Symmetric Functions and Their Derivatives
estfun.btmodel | Bradley-Terry Model Fitting Function
estfun.gpcmodel | Generalized Partial Credit Model Fitting Function
estfun.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
estfun.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
estfun.pcmodel | Partial Credit Model Fitting Function
estfun.raschmodel | Rasch Model Fitting Function
estfun.rsmodel | Rating Scale Model Fitting Function

## -- F --

FirstNames | Popularity of First Names
format.itemresp | Formatting Item Response Data
format.paircomp | Formatting Paired Comparison Data

## -- G --

GermanParties2009 | Choice among German Political Parties
gpcmodel | Generalized Partial Credit Model Fitting Function
guesspar | Extract Guessing Parameters of Item Response Models
guesspar.gpcmodel | Extract Guessing Parameters of Item Response Models
guesspar.nplmodel | Extract Guessing Parameters of Item Response Models
guesspar.pcmodel | Extract Guessing Parameters of Item Response Models
guesspar.raschmodel | Extract Guessing Parameters of Item Response Models
guesspar.rsmodel | Extract Guessing Parameters of Item Response Models

## -- I --

infoplot | Information Plots for IRT Models
is.itemresp | Coercing Item Response Data
is.na.itemresp | Data Structure for Item Response Data
is.na.paircomp | Data Structure for Paired Comparisons
itempar | Extract Item Parameters of Item Response Models
itempar.btmodel | Extract Item Parameters of Item Response Models
itempar.bttree | Extract Item Parameters of Item Response Models
itempar.gpcmodel | Extract Item Parameters of Item Response Models
itempar.nplmodel | Extract Item Parameters of Item Response Models
itempar.pcmodel | Extract Item Parameters of Item Response Models
itempar.raschmodel | Extract Item Parameters of Item Response Models
itempar.raschtree | Extract Item Parameters of Item Response Models
itempar.rsmodel | Extract Item Parameters of Item Response Models
itemresp | Data Structure for Item Response Data

## -- L --

labels.itemresp | Data Structure for Item Response Data
labels.paircomp | Data Structure for Paired Comparisons
labels<- | Set Labels
labels<-.itemresp | Data Structure for Item Response Data
labels<-.paircomp | Data Structure for Paired Comparisons
length.itemresp | Data Structure for Item Response Data
length.paircomp | Data Structure for Paired Comparisons
levels.itemresp | Data Structure for Item Response Data
logLik.btmodel | Bradley-Terry Model Fitting Function
logLik.gpcmodel | Generalized Partial Credit Model Fitting Function
logLik.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
logLik.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
logLik.pcmodel | Partial Credit Model Fitting Function
logLik.raschmodel | Rasch Model Fitting Function
logLik.rsmodel | Rating Scale Model Fitting Function

## -- M --

MathExam14W | Mathematics 101 Exam Results
MemoryDeficits | Memory Deficits in Psychiatric Patients
merge.itemresp | Subsetting Item Response Data
mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
mptspec | Multinomial Processing Tree (MPT) Model Fitting Function
mscale | Extract/Replace Measurement Scale
mscale.itemresp | Data Structure for Item Response Data
mscale.paircomp | Data Structure for Paired Comparisons
mscale<- | Extract/Replace Measurement Scale
mscale<-.itemresp | Data Structure for Item Response Data
mscale<-.paircomp | Data Structure for Paired Comparisons

## -- N --

names.itemresp | Data Structure for Item Response Data
names.paircomp | Data Structure for Paired Comparisons
names<-.itemresp | Data Structure for Item Response Data
names<-.paircomp | Data Structure for Paired Comparisons
nplmodel | Parametric Logistic Model (n-PL) Fitting Function

## -- P --

PairClustering | Pair Clustering Data in Klauer (2006)
paircomp | Data Structure for Paired Comparisons
pcmodel | Partial Credit Model Fitting Function
PCModel.fit | Partial Credit Model Fitting Function
personpar | Extract Person Parameters of Item Response Models
personpar.gpcmodel | Extract Person Parameters of Item Response Models
personpar.nplmodel | Extract Person Parameters of Item Response Models
personpar.pcmodel | Extract Person Parameters of Item Response Models
personpar.raschmodel | Extract Person Parameters of Item Response Models
personpar.rsmodel | Extract Person Parameters of Item Response Models
piplot | Person-Item Plots for IRT Models
plmodel | Parametric Logistic Model (n-PL) Fitting Function
plot.btmodel | Visualizing Bradley-Terry Models
plot.gpcmodel | Visualizing IRT Models
plot.itemresp | Summarizing and Visualizing Item Response Data
plot.nplmodel | Visualizing IRT Models
plot.paircomp | Plotting Paired Comparison Data
plot.pcmodel | Visualizing IRT Models
plot.raschmodel | Visualizing IRT Models
plot.rsmodel | Visualizing IRT Models
predict.gpcmodel | Predict Methods for Item Response Models
predict.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
predict.nplmodel | Predict Methods for Item Response Models
predict.pcmodel | Predict Methods for Item Response Models
predict.raschmodel | Predict Methods for Item Response Models
predict.rsmodel | Predict Methods for Item Response Models
print.anchor | Anchor Methods for the Detection of Uniform DIF the Rasch Model
print.anchortest | Anchor methods for the detection of uniform DIF in the Rasch model
print.btmodel | Bradley-Terry Model Fitting Function
print.discrpar | Extract Discrimination Parameters of Item Response Models
print.gpcmodel | Generalized Partial Credit Model Fitting Function
print.guesspar | Extract Guessing Parameters of Item Response Models
print.itempar | Extract Item Parameters of Item Response Models
print.itemresp | Formatting Item Response Data
print.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
print.mptspec | Multinomial Processing Tree (MPT) Model Fitting Function
print.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
print.paircomp | Formatting Paired Comparison Data
print.pcmodel | Partial Credit Model Fitting Function
print.personpar | Extract Person Parameters of Item Response Models
print.raschmodel | Rasch Model Fitting Function
print.rsmodel | Rating Scale Model Fitting Function
print.summary.anchor | Anchor Methods for the Detection of Uniform DIF the Rasch Model
print.summary.anchortest | Anchor methods for the detection of uniform DIF in the Rasch model
print.summary.btmodel | Bradley-Terry Model Fitting Function
print.summary.gpcmodel | Generalized Partial Credit Model Fitting Function
print.summary.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
print.summary.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
print.summary.pcmodel | Partial Credit Model Fitting Function
print.summary.raschmodel | Rasch Model Fitting Function
print.summary.rsmodel | Rating Scale Model Fitting Function
print.threshpar | Extract Threshold Parameters of Item Response Models
print.upperpar | Extract Upper Asymptote Parameters of Item Response Models
profileplot | Profile Plots for IRT Models

## -- R --

raschmodel | Rasch Model Fitting Function
RaschModel.fit | Rasch Model Fitting Function
regionplot | Region Plots for IRT Models
reorder.paircomp | Subsetting/Reordering Paired Comparison Data
rep.itemresp | Data Structure for Item Response Data
rep.paircomp | Data Structure for Paired Comparisons
rgpcm | Simulate Data under a Generalized Partial Credit Model
rpcm | Simulate Data under a Partial Credit Model
rpl | Simulate Data under a Parametric Logistic IRT Model
rrm | Simulate Data under a Rasch model
rrsm | Simulate Data under a Rating Scale Model
rsmodel | Rating Scale Model Fitting Function
RSModel.fit | Rating Scale Model Fitting Function

## -- S --

Sim3PL | Simulated Data for fitting a 3PL and 3PLu
SoundQuality | Quality of Multichannel Reproduced Sound
SourceMonitoring | Performance in a Source-Monitoring Experiment
StereotypeThreat | Stereotype Threat in Dutch Differential Aptitude Test
str.itemresp | Data Structure for Item Response Data
str.paircomp | Data Structure for Paired Comparisons
subset.itemresp | Subsetting Item Response Data
subset.paircomp | Subsetting/Reordering Paired Comparison Data
summary.anchor | Anchor Methods for the Detection of Uniform DIF the Rasch Model
summary.anchortest | Anchor methods for the detection of uniform DIF in the Rasch model
summary.btmodel | Bradley-Terry Model Fitting Function
summary.gpcmodel | Generalized Partial Credit Model Fitting Function
summary.itemresp | Summarizing and Visualizing Item Response Data
summary.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
summary.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
summary.paircomp | Data Structure for Paired Comparisons
summary.pcmodel | Partial Credit Model Fitting Function
summary.raschmodel | Rasch Model Fitting Function
summary.rsmodel | Rating Scale Model Fitting Function

## -- T --

threshpar | Extract Threshold Parameters of Item Response Models
threshpar.gpcmodel | Extract Threshold Parameters of Item Response Models
threshpar.nplmodel | Extract Threshold Parameters of Item Response Models
threshpar.pcmodel | Extract Threshold Parameters of Item Response Models
threshpar.raschmodel | Extract Threshold Parameters of Item Response Models
threshpar.rsmodel | Extract Threshold Parameters of Item Response Models

## -- U --

update.mptspec | Multinomial Processing Tree (MPT) Model Fitting Function
upperpar | Extract Upper Asymptote Parameters of Item Response Models
upperpar.gpcmodel | Extract Upper Asymptote Parameters of Item Response Models
upperpar.nplmodel | Extract Upper Asymptote Parameters of Item Response Models
upperpar.pcmodel | Extract Upper Asymptote Parameters of Item Response Models
upperpar.raschmodel | Extract Upper Asymptote Parameters of Item Response Models
upperpar.rsmodel | Extract Upper Asymptote Parameters of Item Response Models

## -- V --

vcov.btmodel | Bradley-Terry Model Fitting Function
vcov.discrpar | Extract Discrimination Parameters of Item Response Models
vcov.gpcmodel | Generalized Partial Credit Model Fitting Function
vcov.guesspar | Extract Guessing Parameters of Item Response Models
vcov.itempar | Extract Item Parameters of Item Response Models
vcov.mptmodel | Multinomial Processing Tree (MPT) Model Fitting Function
vcov.nplmodel | Parametric Logistic Model (n-PL) Fitting Function
vcov.pcmodel | Partial Credit Model Fitting Function
vcov.personpar | Extract Person Parameters of Item Response Models
vcov.raschmodel | Rasch Model Fitting Function
vcov.rsmodel | Rating Scale Model Fitting Function
vcov.upperpar | Extract Upper Asymptote Parameters of Item Response Models
VerbalAggression | Situation-Response Questionnaire on Verbal Aggression

## -- W --

worth | Extract Worth Parameters
worth.btmodel | Bradley-Terry Model Fitting Function

## -- X --

xtfrm.itemresp | Data Structure for Item Response Data
xtfrm.paircomp | Data Structure for Paired Comparisons

## -- Y --

YouthGratitude | Measuring Gratitude in Youth

## -- misc --

[.itemresp | Subsetting Item Response Data
[.paircomp | Data Structure for Paired Comparisons