Quote:
Originally Posted by MechanicalRandall
I think I understand the point of the graph, just not the actual arrangement of the data. I understand that you shifted the curves, but what actually makes these curves? How is the data arranged along the x-axis and what are the two colored rectangles for?
Sorry if I'm looking too far into this.
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Once I have the MPG data for each vehicle, I sort them individually so they are in order from lowest to highest.
I add an index column from 1 to 200. Then I shift each vehicle so the middle of their values corresponds to 100. Call it the median, which it is. So the medians of each vehicle cross at 100. Then I plot all vehicles.
Now the two rectangles highlight:
- linear range - those that appear to fall on a line
- exponential - the extreme mileage cases that fall outside of 'normal.'
Those are not strict math definitions but 'eyeballed' to make sense.
Bob Wilson