To the Editor In the empirical model set up by Fleegler et al,1 rates with a common denominator are used on both sides of the regression equation. Such ratio variables are known to produce spurious results in linear regression models.2 This is also applicable to generalized linear models, eg, Poisson regression.2(p380)
Westphal C. Firearm Legislation and Gun-Related Fatalities. JAMA Intern Med. 2013;173(21):2011. doi:10.1001/jamainternmed.2013.9961
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