References

Feenstra, Robert C, Robert Inklaar, and Marcel P Timmer. 2015. “The Next Generation of the Penn World Table.” American Economic Review 105 (10): 3150–82.
Fowler, Martin. 2018. Refactoring: Improving the Design of Existing Code. Addison-Wesley Professional.
Okabe, Masataka, and Kei Ito. 2008. “Color Universal Design (CUD) - How to Make Figures and Presentations That Are Friendly to Colorblind People -.” \url{https://jfly.uni-koeln.de/color/}.
Singh, Aryan. 2025. What Are the Most Popular Sports in the World? WorldAtlas. https://www.worldatlas.com/articles/what-are-the-most-popular-sports-in-the-world.html.
Wickham, Hadley. 2020. The Tidyverse Style Guide. https://https://style.tidyverse.org/.