https://statmodeling.stat.columbia.edu/2024/11/18/5-different-reasons-why-its-important-to-include-a-pre-treatment-variable-when-designing-and-analyzing-a-randomized-experiment/
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https://statmodeling.stat.columbia.edu/2024/11/11/help-teaching-short-course-that-has-a-healthy-dose-of-data-simulation/
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