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Dec 25, 2019 at 13:07 comment added Peter Flom All the combinations of cars and hour make some sort of sense. They each answer different questions.
Dec 25, 2019 at 13:05 comment added DannW Yeah, your right in everything you have said, but if I only use these two variables to measure pollution? I mean, when I make the regression model, I only include "numbers of cars " variable, but does it make sense knowing that this variable has been measured in a specific hour of the day? For example: Measure 1: 100 cars ( hour: 11:00 am) Measure 2: 400 cars (Hour 2:00 pm) Measure 3: 20 cars (Hour 3:00 am )....
Dec 25, 2019 at 12:52 history answered Peter Flom CC BY-SA 4.0