This R code presents the implementation of OSACI algorithms presented in the following article: Aladeemy, M., Adwan, L., Booth, A., Khasawneh, M. T., & Poranki, S. (2020). New feature selection methods based on opposition-based learning and self-adaptive cohort intelligence for predicting patient no-shows. Applied Soft Computing, 86, 105866. DOI: https://doi.org/10.1016/j.asoc.2019.105866