Appendix D.
Trajectory solution diagnostics for marijuana use spanning age 14 to 31 among RYDS participants (G2s n=868)
| 95% CI |
||||||
|---|---|---|---|---|---|---|
| Group | Pi_hat | Lower | Upper | P_hat | Avg. PP | Odds CC |
| Abstainer | 0.492 | 0.452 | 0.532 | 0.504 | 0.950 | 19.6 |
| Early-onset Desistor | 0.124 | 0.093 | 0.155 | 0.108 | 0.880 | 51.7 |
| Late-onset Persistor | 0.241 | 0.207 | 0.275 | 0.249 | 0.900 | 28.4 |
| Early-onset Persistor | 0.060 | 0.039 | 0.080 | 0.057 | 0.880 | 115.9 |
| Increasing Chronic | 0.084 | 0.061 | 0.106 | 0.083 | 0.900 | 98.8 |
Note: Trajectory solution passes all four key model adequacy diagnostics recommended by Nagin (2005)
Abbreviations. CI = Confidence interval; Pi_hat = Mixture probability of classification; P_hat=Hard classification; Avg. PP = Average posterior probability of classification; Odds CC = Odds of correct classification.