Description Format Source Examples
A data frame with 203 observations on 13 variables, each observation is one day. Original data is modified to delete all the missing values.
“ozone” being the outcome variable, other 12 variables are independent variables:
month | Month: 1 = January, ..., 12 = December |
daymonth | Day of month |
dayweek | Day of week: 1 = Monday, ..., 7 = Sunday |
ozone | Daily maximum one-hour-average ozone reading |
press | 500 millibar pressure height (m) measured at Vandenberg AFB |
wind | Wind speed (mph) at Los Angeles International Airport (LAX) |
humid | Humidity (%) at LAX |
tempS | Temperature (degrees F) measured at Sandburg, CA |
tempE | Temperature (degrees F) measured at El Monte, CA |
ibht | Inversion base height (feet) at LAX |
pressg | Pressure gradient (mm Hg) from LAX to Daggett, CA |
ibtemp | Inversion base temperature (degrees F) at LAX |
vis | Visibility (miles) measured at LAX |
Leo Breiman, Department of Statistics, UC Berkeley. Data used in Leo Breiman and Jerome H. Friedman (1985), Estimating optimal transformations for multiple regression and correlation, J. Amer. Stat. Assoc., 80, 580 – 598.
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