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fourPNO (version 1.0.3)
Bayesian 4 Parameter Item Response Model
Description
Estimate Barton & Lord's four parameter IRT model with lower and upper asymptotes using Bayesian formulation described by Culpepper (2015).
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Install
install.packages('fourPNO')
Monthly Downloads
239
Version
1.0.3
License
GPL (>= 2)
Maintainer
Steven Andrew Culpepper
Last Published
December 16th, 2015
Functions in fourPNO (1.0.3)
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update_theta
Internal Function for Updating Theta in Gibbs Sampler
rmvnorm
Generate Random Multivariate Normal Distribution
update_WKappaZ_NA
Update Lower and Upper Asymptote Parameters of 4PNO
Gibbs_2PNO
Gibbs Implementation of 2PNO
update_ab_NA
Update a and b Parameters of 2PNO, 3PNO, 4PNO
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
update_2pno
Update 2PNO Model Parameters
Gibbs_4PNO
Gibbs Implementation of 4PNO
Y_4pno_simulate
Simulate from 4PNO Model
kappa_initialize
Initialize Thresholds