Table 8. Characteristics of numeric variables for the file (gas92.dat) containing the gas fuel
statistics from the United Nations Energy Statistics Database
| Number of | Minimum | Maximum | ||
| Variable | observations | value | value | Mean |
| COUNTRY | 9513 | 4.00 | 891.00 | 401.97 |
| YEAR | 9513 | 1950.00 | 1992.00 | 1975.47 |
| QUANTITY | 9513 | -486480.00 | 27907965.00 | 316082.78 |