$3\mathrm{.}8$ LAB: Models with interaction terms

The forestfires.csv data base contains information on $517$ forest fires that occurred in Montesinho Natural Park in Portugal. The columns report the temperature, relative humidity, wind speed, and amount of rainfall at the time of the fire, as well as the area burned.

Read in the file forestfires.csv$.$

Perform multiple linear regression using the ols$()$ function with area as the response variable and wind and the interaction term RH$*$temp$,$ in that order, as the predictor variables.

Create and print the ANOVA table.

If rain is used instead of wind, the output is:

sum$\_$sq df F PR$(>$F$)$

rain $1\mathrm{.}239028$e$+011\mathrm{.}00\mathrm{.}0030710\mathrm{.}955829$

RH $1\mathrm{.}435916$e$+031\mathrm{.}00\mathrm{.}3558940\mathrm{.}551059$

temp $9\mathrm{.}949932$e$+031\mathrm{.}02\mathrm{.}4661070\mathrm{.}116943$

RH:temp $3\mathrm{.}238244$e$+031\mathrm{.}00\mathrm{.}8026040\mathrm{.}370737$

Residual $2\mathrm{.}065752$e$+06512\mathrm{.}0$ NaN NaN