Optimal Weight Exchange Algorithm for Optimal Designs for Three Models R package OWEA version 0.1.2 An implementation of optimal weight exchange algorithm Yang(2013) <doi:10.1080/01621459.2013.806268> for three models. They are Crossover model with subject dropout, crossover model with proportional first order residual effects and interference model. You can use it to find either A-opt or D-opt approximate designs. Exact designs can be automatically rounded from approximate designs and relative efficiency is provided as well. Software Imports: gtools (>= 3.9.3), MASS, methods, shiny (>= 1.7.2) Suggests: knitr, rmarkdown Shuai Hao <shuaih0303@gmail.com> Comprehensive R Archive Network (CRAN) Shuai Hao [aut, cre], Min Yang [aut], Wei Zheng [aut] GPL-3 2022-09-17 application/tgz https://CRAN.R-project.org/package=OWEA doi:10.32614/CRAN.package.OWEA