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The first chart looks like the countries are deliberately selected to obscure the comparison rather than to reveal anything. The snapshot of single time point comparisons leaves many questions about the comparability unanswered. A better analysis would be to compare the rates over time within each country before and after a ban (and maybe for a larger group that actually included some of the key countries like Australia or the UK who used to allow some guns and now don't). This before and after comparison removes a lot of the inherent differences among countries and directly addresses the question. The current country selection is clearly biased by the omission of the UK anyway since we are one of the larger examples of a country where handguns were allowed but are no longer allowed.
Toggle Commented Jan 23, 2013 on Interpreting some charts about guns at Junk Charts
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Jan 23, 2013