Visualization of Restricted Cubic Splines R package rcssci version 0.4.0 Restricted Cubic Splines were performed to explore the shape of association form of "U, inverted U, L" shape and test linearity or non-linearity base on "Cox,Logistic,linear,quasipoisson" regression, and auto output Restricted Cubic Splines figures. rcssci package could automatically draw RCS graphics with Y-axis "OR,HR,RR,beta". The Restricted Cubic Splines method were based on Suli Huang (2022) <doi:10.1016/j.ecoenv.2022.113183>,Amit Kaura (2019) <doi:10.1136/bmj.l6055>, and Harrell Jr (2015, ISBN:978-3-319-19424-0 (Print) 978-3-319-19425-7 (Online)). Software Depends: R (>= 4.2.0) Imports: pacman, rms, ggplot2, survminer, segmented, survival, dplyr, patchwork, Cairo Zhiqiang Nie <niezhiqiang@gdph.org.cn> Comprehensive R Archive Network (CRAN) Zhiqiang Nie [aut, cre, cph] (ORCID = 0000-0001-7642-3286, wechat = Biostatistics-SCI), JunZhang [ctb], Chaolei Chen [ctb] Artistic-2.0 2023-02-15 application/tgz https://CRAN.R-project.org/package=rcssci doi:10.32614/CRAN.package.rcssci