An Argument for the QCD (Quasi-Experimental Controlled Design): Part 2

In what follows, I will refer to any causal study without controlled randomization as both an “observational study” and a “quasi-experimental study.” I’ll begin with “observational,” as it’s more widely used outside economics, but I’ll shift to “quasi-experimental” as I introduce a new acronym: QCD—the Quasi-Experimental Controlled Design. This phrasing…