fourPNO

Estimate Barton & Lord’s (1981) https://doi.org/10.1002/j.2333-8504.1981.tb01255.x four parameter IRT model with lower and upper asymptotes using Bayesian formulation described by Culpepper (2016) https://doi.org/10.1007/s11336-015-9477-6.

Installation

You can install fourPNO from CRAN using:

install.packages("fourPNO")

Or, you can be on the cutting-edge development version on GitHub using:

if(!requireNamespace("devtools")) install.packages("devtools")
devtools::install_github("tmsalab/fourPNO")

Usage

To use the fourPNO package, load it into R using:

library("fourPNO")

Inside the package, the estimation routines can be viewed as:

• Gibbs_2PNO()
• Gibbs_4PNO()

Author

Steven Andrew Culpepper

Citing the fourPNO package

To ensure future development of the package, please cite fourPNO package if used during an analysis or simulation study. Citation information for the package may be acquired by using in R:

citation("fourPNO")

License

GPL (>= 2)