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, ...

This is a preview. Log in through your library . Abstract The Mantel-Haenszel test of treatment, response independence within strata in an s × t × r contingency table is reviewed. In the case of one ...

This is one in a series of lecture notes which, if tied together into a textbook, might be entitled "Practical Regression." The purpose of the notes is to supplement the theoretical content of most ...

Background: It is well known that individual-level social capital is positively associated with health, but most preceding studies have not fully controlled for an individual's time-invariant ...