OpenIntro features a number of free books that can be used in high school and AP statistics courses. The license on these datasets is currently unknown. You can find out more about OpenIntro at https://www.openintro.org.
An experiment that studies effectiveness of stents in treating patients atrisk of stroke with some unexpected results. These data represent theresults 365 days after stroke.
group - a factor with levels control and treatment
outcome - a factor with levels no event and stroke