Advanced response surface analysis. The main function RSA computes and compares several nested polynomial regression models (full second or thirdorder polynomial, shifted and rotated squared difference model, rising ridge surfaces, basic squared difference model, asymmetric or leveldependent congruence effect models). The package provides plotting functions for 3d wireframe surfaces, interactive 3d plots, and contour plots. Calculates many surface parameters (a1 to a5, principal axes, stationary point, eigenvalues) and provides standard, robust, or bootstrapped standard errors and confidence intervals for them.
Package details 


Author  Felix Schönbrodt [cre, aut], Sarah Humberg [aut] 
Maintainer  Felix Schönbrodt <felix@nicebread.de> 
License  GPL (>= 2) 
Version  0.10.4 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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