options. Thus, we conclude that differences in tract variability are unlikely to artificially drive our estimates. Second, we also conducted placebo tests with all in-sample data before the ban by testing for treatment effects two weeks before the actual policy intervention in the MARTA and ...
The longing to travel is as much a part of the collective human spirit as the profit motive, but the two always have been considered more or less incompatible. Nevertheless, as information tools keep improving, so does our range of lifestyle options. For five years, I have been running a ...