Sure I can -- but it's not very interesting unless you expand the model. For example, for a ride I did this weekend that climbed 1500 feet and then descended back home the zero order correlation between power and speed was -0.3 because I was going slow uphill at high power (or what passes for high power for me) and was zooming back downhill at high speed and very low power.

If you expand the model to include total mass, air density, air speed, and maybe something for drive train losses, the model fit becomes much more interesting.