This is the ozone data used in Breiman and Friedman (1985). This dataset contains 330 observations, and each observation is a daily measurement.
data(ozone)| ozone | Ozone reading |
| temp | Temperature (degree C). minimum 25 and maximum 93 in original scale. |
| invHt | Inversion base height (feet). minimum 111 and maximum 5000 in original scale. |
| press | Pressure gradient (mm Hg). minimum -69 and maximum 107 in original scale. |
| vis | Visibility (miles). minimum 0 and maximum 350 in original scale. |
| milPress | 500 millibar pressure height (m). minimum 5320 and maximum 5950 in original scale. |
| hum | Humidity (percent). minimum 19 and maximum 93. |
| invTemp | Inversion base temperature (degrees F). minimum -25 and maximum 332 in original scale. |
| wind | Wind speed (mph). minimum 0 and maximum 21 in original scale. |
All the variables, except for the response, have been scaled to [0,1] interval. To transform back to the original scale, use the formula: $$x=min+(max-min)*z.$$