“It calculates the ratio of percent of all homicides in a given offender– victim race category to the percentage of execution-related homicides for that same category. If an equal percentage of homicides led to execution, the ratio would be 1.00. Numbers below 1.00 indicate that such homicides are relatively unlikely to lead to an execution, and numbers above 1.00 show where the executions are statistically more likely…

White-on-White crime is consistently treated in a proportionate manner, with an overall ratio 1.02. Roughly the same percentage of these homicides leads to execution as not.  This is what we would expect in the absence of any kind of bias for or against victims or perpetrators. In both of the victim/perpetrator combinations with Black victims, however, overall ratios are well below 1, meaning that killers of Black victims are substantially less likely than killers of Whites to be executed. Of course, the low odds of execution are particularly stark in the case of White-on-Black crime, for which the overall ratio is 0.34… Black-on-White murders make up a far larger proportion of all executions than they do of all homicides. While Whites who killed Blacks are vastly under-represented in the list of those executed, Blacks with White victims are dramatically over-represented. These trends are stark, consistent over time, and overwhelming in their magnitude.” (Baumgartner, Grigg, & Mastro (2015), p216-7)

Homicide:Execution ratios by race of perpetrator and victim, 1975-2005
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