Analysis of Selection Index in Plant Breeding R package selection.index version 2.0.1 CRAN Task View: Agriculture (https://CRAN.R-project.org/view=Agriculture) Provides tools for the simultaneous improvement of multiple traits in plant breeding. Building upon the classical selection index (Smith 1937 <doi:10.1111/j.1469-1809.1936.tb02143.x>) and modern quantitative genetics (Kang 2020 <doi:10.1007/978-3-319-91223-3>), this package calculates classical phenotypic, genomic, marker-assisted, restricted/constrained, and eigen selection indices. It also incorporates multi-stage selection evaluation and stochastic simulations to estimate genetic advance based on economic weights, heritability, and genetic correlations. Software Depends: R (>= 3.5.0) Imports: MASS, Rcpp, stats, utils LinkingTo: Rcpp, RcppEigen Suggests: rmarkdown, markdown, knitr, testthat (>= 3.0.0) Zankrut Goyani <zankrut20@gmail.com> Comprehensive R Archive Network (CRAN) Zankrut Goyani [aut, cre, cph] GPL (>= 3) 2026-03-08 application/tgz https://CRAN.R-project.org/package=selection.index doi:10.32614/CRAN.package.selection.index en-US