I began from the taking a look at the chance of recidivism score. Our 1st study checked out the easy delivery of COMPAS ong whites and you can blacks. I plotted the fresh new shipping of those scores to possess six,172 defendants who’d maybe not already been arrested having yet another offense otherwise that has recidivated in this two years.
These types of histograms show that scores to have white defendants were skewed to your lower-exposure groups, if you are black colored defendants was basically equally marketed all over scores. Inside our two-12 months attempt, there have been 3,175 black colored defendants and you may 2,103 white defendants, which have step 1,175 ladies defendants and you may 4,997 men defendants. There had been dos,809 defendants whom recidivated contained in this 2 years in this attempt.
The new histograms to own COMPAS’s criminal risk rating along with let you know a difference for the get shipments between white and you will black colored defendants. New take to i always sample COMPAS’s violent recidivism get is actually somewhat smaller compared to into the standard recidivism get: cuatro,020 defendants, step 1,918 black defendants and you will 1,459 white defendants. There have been 652 unlawful recidivists.
Because there is an obvious difference in the newest withdrawals of COMPAS results to possess white and you can black defendants, merely looking at the withdrawals doesn’t make up most other market and you will behavioral factors.