| Value |
Category |
| 1 |
very easy |
| 2 |
fairly easy |
| 3 |
neither easy nor difficult |
| 4 |
fairly difficult |
| 5 |
very difficult |
| 7 |
dk |
| 8 |
na |
| 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.