Let X1, X2, ⋯, Xn be n independent random variables each distributed uniformly over the interval (0, 1), and let Y0, Y1, ⋯, Yn be the respective lengths of the n + 1 segments into which the unit ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Identifying causal relationships from observational data is not easy. Still, ...