flag for negative self employment income
Datafile
| Valid Observations | 1406 |
| Valid Observations | 1734 |
| Valid Observations | 1695 |
| Valid Observations | 1978 |
| Valid Observations | 1366 |
| Valid Observations | 1338 |
| Valid Observations | 1838 |
| Valid Observations | 1455 |
| Valid Observations | 1245 |
| Valid Observations | 1319 |
| Valid Observations | 1407 |
| Valid Observations | 1189 |
| Valid Observations | 1205 |
| Valid Observations | 1381 |
| Valid Observations | 1027 |
