Estimating IRT Parameters using the IRT Methodology


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Documentation for package ‘IRTpp’ version 0.2.6.1

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IRTpp-package IRTpp : Item Response Theory Implemented in R and Cpp
alpha.c Cronbach-Mesbah Curve
alpha.cronbach Cronbach's alpha
an.parallel Parallel Analysis
biserial.cor Biserial Correlation
gutt Guttman's Lambda
individual.traits Estimate the latent traits.
information Test or Item information
irtpp Estimate a test item parameters.
irtpp.model Valid model
irtpp.models Available models
model.transform Model transformations
normalize Normalize a vector
orlando_itemf Orlando's statistic
parameter.list Parameter list form
parameter.matrix Parameter matrix form
pattern.expand Expansion of patterns
phi Phi coefficient of correlation
plotenvelope Confidence bands
plotevenlope Confidence bands
polyserial.cor Polyserial correlation
prob.2pl 2PL fast probability function
prob.3pl 3PL fast probability function
probability.1pl 1PL probability function
probability.2pl 2PL probability function
probability.3pl 3PL probability function
rtnorm Truncated normal simulation
SimulateItemParameters Simulates item parameters for UIRT models.
simulateItemParameters Simulates item parameters for UIRT models.
simulateTest Simulates a test
simulateTest.file This function simulates tests according to a IRT model.
simulateTestMD Simulate test Multidimensional
test.plot Plot a test or an item.
Yule Yule coefficient of correlation
z3_itemf Z3 statistic.
z3_personf Z3 Person fit statistic