Item response theory based methods are used to compute linking constants and conduct chain linking of unidimensional or multidimensional tests for multiple groups under a common item design. The unidimensional methods include the Mean/Mean, Mean/Sigma, Haebara, and Stocking-Lord methods for dichotomous (1PL, 2PL and 3PL) and/or polytomous (graded response, partial credit/generalized partial credit, nominal, and multiple-choice model) items. The multidimensional methods include the least squares method and extensions of the Haebara and Stocking-Lord method using single or multiple dilation parameters for multidimensional extensions of all the unidimensional dichotomous and polytomous item response models. The package also includes functions for importing item and/or ability parameters from common IRT software, conducting IRT true score and observed score equating, and plotting item response curves/surfaces, vector plots, information plots, and comparison plots for examining parameter drift.
| Version: | 1.5-1 |
| Depends: | R (≥ 3.3.3), methods, lattice |
| Imports: | MASS, statmod |
| Published: | 2017-04-26 |
| Author: | Jonathan P. Weeks |
| Maintainer: | Jonathan P. Weeks <weeksjp at gmail.com> |
| License: | GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| NeedsCompilation: | no |
| Citation: | plink citation info |
| Materials: | NEWS |
| CRAN checks: | plink results |
| Reference manual: | plink.pdf |
| Vignettes: |
plink: An R Package for Linking Mixed-Format Tests Using IRT-Based Methods |
| Package source: | plink_1.5-1.tar.gz |
| Windows binaries: | r-devel: plink_1.5-1.zip, r-release: plink_1.5-1.zip, r-oldrel: plink_1.5-1.zip |
| OS X El Capitan binaries: | r-release: plink_1.5-1.tgz |
| OS X Mavericks binaries: | r-oldrel: not available |
| Old sources: | plink archive |
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