Research examining death penalty deterrence has been characterized as inconclusive and uninformative. The present analysis heeds a recommendation from prior research to examine single-state changes in death penalty policy using the synthetic control method. Data from the years 1979–2019 were used to construct synthetic controls and estimate the effects of death penalty moratoriums on homicide rates in Illinois, New Jersey, Washington, and Pennsylvania. Moratoriums on capital punishment resulted in nonsignificant homicide reductions in all four states.

中文翻译：

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使用综合控制方法估计暂停死刑对凶杀率的影响

检查死刑威慑力的研究被认为是不确定的和无信息的。本分析听取了先前研究的建议，使用综合控制方法检查死刑政策的单一状态变化。1979 年至 2019 年的数据被用于构建综合控制并估计暂停死刑对伊利诺伊州、新泽西州、华盛顿州和宾夕法尼亚州凶杀案发生率的影响。暂停执行死刑导致所有四个州的凶杀案都没有显着减少。