Gradient Projection Algorithms for Factor Rotation. For details see
?GPArotation. When using this package, please cite: Bernaards and
Jennrich (2005) <doi:10.1177/0013164404272507>. "Gradient Projection
Algorithms and Software for Arbitrary Rotation Criteria in Factor
Analysis".

Homepage:
https://CRAN.R-project.org/package=GPArotation
