Root Mean Square Curvature Calculation R package IPEC version 1.1.2 Calculates the RMS intrinsic and parameter-effects curvatures of a nonlinear regression model. The curvatures are global measures of assessing whether a model/data set combination is close-to-linear or not. See Bates and Watts (1980) <doi:10.1002/9780470316757> and Ratkowsky and Reddy (2017) <doi:10.1093/aesa/saw098> for details. Software Depends: R (>= 4.2.0) Imports: numDeriv (>= 2016.8-1.1), MASS Peijian Shi <pjshi@njfu.edu.cn> Comprehensive R Archive Network (CRAN) Peijian Shi [aut, cre], Peter M. Ridland [aut], David A. Ratkowsky [aut], Yang Li [aut] GPL (>= 2) 2025-09-26 application/tgz https://CRAN.R-project.org/package=IPEC doi:10.32614/CRAN.package.IPEC