| Value | Category |
|---|---|
| 0 | None |
| 1 | Mediation |
| 2 | Other relations |
| 3 | Obtain the largest number of certificates |
| 4 | Obtain a certificate from promoted university |
| 5 | Certificate specialty |
| 6 | Luck |
| 7 | Living in a major city |
| 8 | Experince |
| 9 | Gender 'Female' |
| 10 | Gender 'Male' |
| 11 | Bribe |
| 12 | Have a job |
| 13 | Effeciency |
| 14 | Behaviour and ethics |
| 96 | Other factor |
| 2147483625 | Don't know |
| 2147483634 | Missing |
| 2147483636 | Other |
| 2147483639 | Refused |
| Sysmiss |