rdd

Did the 1988 California cigarette tax reduce cigarette sales, and do different methods agree on how much? This R tutorial applies six ways of evaluating a policy to the same data and finds that most point to a drop of roughly 13 to 20 packs per person each year. It comes with an interactive app that runs in your web browser.

Does extra tutoring raise final exam scores? In Stata, we compare students who scored just below and just above the cutoff of 70 on an entrance exam that decided who got tutoring, and find gains of about 9 to 11 points. It comes with an interactive app that runs in your web browser.