Value |
Category |
0 |
|
1 |
it is easy |
2 |
it is difficult |
3 |
it is very difficult |
4 |
impossible |
5 |
I donot know |
6 |
I never asked |
7 |
other |
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.