Advanced Response Surface Analysis R package RSAtools version 0.1.2 Provides tools for response surface analysis, using a comparative framework that identifies best-fitting solutions across 37 families of polynomials. Many of these tools are based upon and extend the 'RSA' package, by testing a larger scope of polynomials (+27 families), more diverse response surface probing techniques (+acceleration points), more plots (+line of congruence, +line of incongruence, both with extrema), and other useful functions for exporting results. Software Depends: R (>= 2.15.0), lavaan (>= 0.5.20), semTools (>= 0.5-5), RSA (>= 0.10.4), ggplot2, lattice Imports: plyr, RColorBrewer, aplpack, methods, MASS Suggests: fields, rgl, qgraph, tcltk, tkrplot, testthat, covr, psych, ggpubr Fernando Núñez-Regueiro <fernando.nr.france@gmail.com> Comprehensive R Archive Network (CRAN) Fernando Núñez-Regueiro [aut, cre] (ORCID: <https://orcid.org/0000-0003-4784-2021>), Jacques Juhel [aut] (ORCID: <https://orcid.org/0000-0002-3520-6012>), Felix Schönbrodt [ctb] (ORCID: <https://orcid.org/0000-0002-8282-3910>), Sarah Humberg [ctb] (ORCID: <https://orcid.org/0000-0002-7891-3622>) GPL (>= 2) 2025-09-01 application/tgz https://CRAN.R-project.org/package=RSAtools doi:10.32614/CRAN.package.RSAtools