5 times because the going to recidivate once the people in the lower (score step one to 4) classification. Northpointe’s research, found that individuals with highest ratings (results 8 so you can ten) was basically 5.6 minutes since the planning recidivate. Both efficiency imply that the brand new rating keeps predictive really worth.
6 percent. It means for all the randomly chose pair of defendants regarding sample, the fresh COMPAS system is accurately review their recidivism risk 63.6 % of time (age.grams. if an individual person of your pair recidivates, that pair often count due to the fact a profitable fits if that person along with got a higher rating). In its data, Northpointe said a somewhat highest concordance: 68 %.
Powering the fresh new Cox model on the underlying risk score – rated step 1 so you can 10 – rather than the low, medium and you will highest menstruation yielded a slightly highest concordance out of 66.cuatro per cent.