The Debate on Shall-Issue Laws, Continued

In the September 2008 issue of this journal we criticized work by Ian Ayres and John Donohue on the relation between right-to-carry gun laws and crime rates. They replied in the January 2009 issue. Here we respond to their reply.

On the Choice of Control Variables in the Crime Equation

Although control variables are the reason for multiple regression, surprising little attention is given to the process of locating and selecting the controls. If important controls are omitted, estimates can be biased and inconsistent whereas using too many controls...
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