Dear Statalisters,

Although I have been working with Stata for a few years now, I ran across a need to test a model in a somewhat different than usual way. This is a normal quantile regression of Sales Price on Cost
Array

What is needed to be tested is the relationship such as
Array or Array
It is very important to test the goodness of fit of such model within an existing data and of course the statistical significance.
Not sure if it is possible, but if yes, your help is very much appreciated.

Sincerely,

Pavlo