13 Key Questions (and Answers) about Gun Violence

Want to know more about gun violence in the United States? The Atlantic has one of the best primers available on the subject. One key finding:

What has worked to reduce gun violence?

This is not an easy question to answer, because crime rates can decline for a wide range of reasons. For example, violent crime rates declined sharply all across the country in the mid-1990s, regardless of whether a given area had tightened its gun laws. So based on a naive interpretation of the numbers, any attempt at reducing gun violence in 1995 would have appeared successful by 1998. Then there is the problem of comparing different states or cities: Circumstances differ, and what works in Memphis may fail in Detroit.

Nonetheless, there are some plausible methods for isolating the different factors, using comparison groups or other controls. The most thorough summary is a 2008 meta-analysis where the authors reviewed every prior American gun violence reduction study, examining both the reported effectiveness and the strength of the statistical evidence.