| Value |
Category |
| -99 |
COULD NOT OBSERVE |
| 1 |
VERY FAR FROM SURFACE (>1 METER) |
| 2 |
WITHIN 1 METER |
| 3 |
VERY CLOSE TO SURFACE OR FULL |
| 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.