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December 6, 2016

Errors in Equation and Modeling Parameter

JAMA. 2016;316(21):2277. doi:10.1001/jama.2016.18002

In the Original Investigation entitled “Association Between Gun Law Reforms and Intentional Firearm Deaths in Australia, 1979-2013,” published in the July 19, 2016, issue of JAMA,1 2 small typographical errors occurred. In the Methods section, in the equation for Model c, the second operator should be a plus sign (not an equals sign). Also in the Methods section, a paragraph describing the models should use the expression eβ32 as such: “The 3 models are related because the model is parameterized, β32 = β11−β10 , and therefore, eβ32 estimates the ratio of annual trend.…” The article was corrected online.

Chapman  S, Alpers  P, Jones  M.  Association between gun law reforms and intentional firearm deaths in Australia, 1979-2013.  JAMA. 2016;316(3):291-299.PubMedGoogle ScholarCrossref