Generalizability and Transportability Playlist

Catherine Lesko and Kara Rudolph

External validity, more specifically, generalizability or transportability refers to the degree to which an internally valid study conducted in one sample can teach us about the expected effect in a specific target population. The following playlist summarizes the theory underpinning the link between a study result and the desired target average treatment effect (estimand), describes available estimators for the target average treatment effect, and provides a few illustrative examples.