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* ===How it is tested? ===
* ===What do the tests achieve? ===
* ===How could the tests be improved? ===* ===What are the tests' strengths and weaknesses? ===* ===Can you think of any alternative empirical tests?===
→Empirical Questions
All of this is on page 2 and 3 of the paper.
The author compares adjacent county-pairs that straddle borders.
Note that the same county can be in multiple pairs, and therefore is in the sample multiple times. This creates the need for multidimensional clustering as developed by Cameron et al, 2006. Standard errors are clustered for both within-state over time correlations of county residuals, as well as within borer-segment. Discussion of these in first paragraph of Section 5 on page 22.
The tests reject the null hypotheses (a)-(c) and (e).
