Correcting the methodological flaws in an original report by Lester in 1987 showed extraversion was not related to the homicide rate and the national measure of neuroticism was not related to the suicide rate for 18 industrial nations.
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References
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LynnR.HampsonS. L.National differences in extraversion and neuroticism. British Journal of Social and Clinical Psychology, 1975, 14, 223–240.