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fourPNO (version 1.0.2)

Bayesian 4 Parameter Item Response Model

Description

Estimate Lord & Barton's four parameter IRT model with lower and upper asymptotes using Bayesian formulation described by Culpepper (2015).

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Version

Install

install.packages('fourPNO')

Monthly Downloads

70

Version

1.0.2

License

GPL (>= 2)

Maintainer

Steven Andrew Culpepper

Last Published

November 13th, 2015

Functions in fourPNO (1.0.2)

update_WKappaZ_NA

Update Lower and Upper Asymptote Parameters of 4PNO
update_theta

Internal Function for Updating Theta in Gibbs Sampler
Y_4pno_simulate

Simulate from 4PNO Model
min2LL_4pno

Compute 4PNO Deviance
update_ab_norestriction

Update a and b Parameters of 4pno without alpha > 0 Restriction
Total_Tabulate

Calculate Tabulated Total Scores
Gibbs_2PNO

Gibbs Implementation of 2PNO
update_2pno

Update 2PNO Model Parameters
kappa_initialize

Initialize Thresholds
rmvnorm

Generate Random Multivariate Normal Distribution
Gibbs_4PNO

Gibbs Implementation of 4PNO
update_ab_NA

Update a and b Parameters of 2PNO, 3PNO, 4PNO