Table 1.
Summary statistics of the 6 variables in the COMPAS study
| Variable n (%) | All (n = 7,214) | No 2-year recidivism (n = 3,743) | With 2-year recidivism (n = 3,471) | Chi-squared test p value |
|---|---|---|---|---|
| Age | ||||
| 18–20 years | 220 (3.0) | 47 (1.3) | 173 (5.0) | <0.001 |
| >20 years | 6,994 (97.0) | 3,696 (98.7) | 3,298 (95.0) | |
| Gender | ||||
| Female | 1,395 (19.3) | 865 (23.1) | 530 (15.3) | <0.001 |
| Male | 5,819 (80.7) | 2,878 (76.9) | 2,941 (84.7) | |
| Race | ||||
| African American | 3,696 (51.2) | 1,660 (44.3) | 2,036 (58.7) | <0.001 |
| Others | 3,518 (48.8) | 2,083 (55.7) | 1,435 (41.3) | |
| Prior criminal history | ||||
| Yes | 2,150 (29.8) | 1,478 (39.5) | 672 (19.4) | <0.001 |
| No | 5,064 (70.2) | 2,265 (60.5) | 2,799 (80.6) | |
| Juvenile criminal history | ||||
| Yes | 6,241 (86.5) | 3,489 (93.2) | 2,752 (79.3) | <0.001 |
| No | 973 (13.5) | 254 (6.8) | 719 (20.7) | |
| Current charge | ||||
| Degree misdemeanor | 2,548 (35.3) | 1,496 (40.0) | 1,052 (30.3) | <0.001 |
| Others | 4,666 (64.7) | 2,247 (60.0) | 2,419 (69.7) | |