The time between taking a medication and reaching the peak level of effectiveness is obviously different between teenagers and elderlies. The following plot shows the time

(in minutes) reaching peak level vs. amount (in milligram)

of consume for teenagers (green) and elderlies (purple).

(Data in Medication Effectiveness)

a) How would you code the indicator variable? (Use teenagers as the base level.)

b) How would you construct the interaction term variable?

Transcribed Image Text:

14 42 12 Time vs Amount 10 8 Time (in minutes) 16 4 2 0 140 160 180 200 220 240 260 280 Amount (in milligram)