For those tackling complex research designs, Stata 18 includes several "exclusive" statistical additions:
One of the biggest leaps in version 18 is the refinement of the and collect system.
Difference-in-Differences (DiD) has exploded in popularity. However, standard DiD fails with multiple time periods and staggered treatment adoption. The solution is the did command, which implements Callaway & Sant’Anna (2021) estimators.
