Hi - excuse my ignorance on the following: I have a sample of paired data (d = x1 - x2), however the differences increase with x1 (or x2)? Any suggestions on how should I model this?
The pairs are specific car models; x1, x2 are repair times for cars, calculated on two different systems (1 and 2). X1, X2 can vary from 3 hours (front wing only) up to 60-70 hrs (roll-over etc.), and d = x1-x2 tends to increase with `x'.
Many thanks,
Murray Doyle
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