Welcome to the website for Programming tools in data science, given at HEC Lausanne in fall 2022-2023. The main objective is to introduce the R language programming language the data scientists. The focus of this class is on notions of data manipulation, data analysis, data visualization, reproducible research, version control and result-sharing. At the end of the class, a student should be able to construct its own R package ans Shiny app, make it available on GitHub, document it using literate programming and render it visible by making a website.