Quasi-Experiments

Quasi-experiments

A) provide a bridge between the econometric analysis of observational data sets and the statistical ideal of a true randomized controlled experiment.
B) are not the same as experiments, and lessons learned from the use of the latter can therefore not be applied to them.
C) most often use difference-in-difference estimators, which are quite different from OLS and instrumental variables methods studied in earlier chapters of the book.
D) use the same methods as studied in earlier chapters of the book, and hence the interpretation of these methods is the same.