John -

One suggestion: Explain the variation in price using more explanatory
variables (i.e., other characteristics of the cars). Use multiple
regression.

- Mike
www.MikeMiddleton.com


"JohnH" wrote in message ...

I made a scattergraph (Car price Y; Km X). It is ok for comparison at say a
given level of Km, but as prices are scaled from $4000 to $7500 and 0 to
120 kliometers it is a little artificial in so far as an extra $1000 might
get a car that has done 40,000 fewer km .

I'm wondering what statistical/ mathematical measures I might use to
squeeze more out of the data.

Hope that's not confusing, thanks
John