I have a parameter M (x) (ex weight) and one other N (y) (ex height).

We calculate the regression : y = ax+b

We have an other parameter O (y') (ex blood pressure), and always the parameter M (x) (ex weight): y' = a'x+b'

Here are the two :

*(y)........................-..........* (y')

*........................-..........+..*

*......................-.....+.........*

*...................-+.................*

*..............+..-....................*

*........+......-......................*

*...+.........-........................*

*............-..........................*

** * * * * * * * * * * * * * * (x)

Paramètre N : y = ax+b (+)

Paramètre O : y' = a'x+b' (-)

What can I say between N (y) (height) and O (y') (blood pressure) ???

Is it possible to calculate something like a correlation (with the angle between the two curves) ???

Regards