| Value |
Category |
| -999 |
rta |
| -777 |
|
| -555 |
Other |
| -222 |
na |
| 1 |
Concrete/Stone |
| 2 |
Red earth |
| 3 |
Wood |
| 4 |
Animal manure |
| 5 |
Bare ground |
| 6 |
Tarpaulin/Plastic |
| 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.