To cite the 'PP' package in publications use:
Reif M, Steinfeld J (2021).PP: Estimation of person parameters for the 1,2,3,4-PL model and the GPCM..R package version 0.6.3-11,https://github.com/jansteinfeld/PP.
Corresponding BibTeX entry:
@Manual{, title = {PP: Estimation of person parameters for the 1,2,3,4-PL model and the GPCM.}, author = {Manuel Reif and Jan Steinfeld}, year = {2021}, note = {R package version 0.6.3-11}, url = {https://github.com/jansteinfeld/PP}, }