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→How it is tested?
<b>QUESTION ABOUT EQUATION 11 ON PG 22</b>: Why are the two <math>D</math> dummy variables summed?
The author goes on to state that <math>\beta</math> is supposed to represent the effect of an additional poll tax or literacy test within a state. He also notes that the laws are highly collinear -- ie, they tend to co-exist together -- and there is little information in the independent dummies.
Given this, I would think that he'd want to estimate the effect of having (either) a poll tax or a literacy test, not the sum of both.
The author does note that in an earlier version of the paper he estimated the effects of poll taxes and literacy tests separately and reached similar qualitative conclusions with slightly smaller standard errors.
===What do the tests achieve?===
