Value |
Category |
1 |
1. Per month |
2 |
2. Per semester |
3 |
3. Per year |
5 |
5. Others |
6 |
6. None |
9 |
9. Missing |
Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.