Nonparametric, Tuning-Free Estimation of S-Shaped Functions R package Sshaped version 1.2 Estimation of an S-shaped function and its corresponding inflection point via a least squares approach. A sequential mixed primal-dual based algorithm is implemented for the fast computation. Details can be found in Feng et al. (2022) <doi:10.1111/rssb.12481>. Software Depends: R (>= 3.4.0) Imports: Rcpp (>= 1.0.5) LinkingTo: Rcpp, RcppArmadillo Yining Chen <y.chen101@lse.ac.uk> Comprehensive R Archive Network (CRAN) Oliver Y. Feng [aut], Yining Chen [aut, cre], Qiyang Han [aut], Raymond J. Carroll [aut], Richard J. Samworth [aut] GPL-2 2025-09-22 application/tgz https://CRAN.R-project.org/package=Sshaped doi:10.32614/CRAN.package.Sshaped