Hi,

I'm fairly new to SPSS, and have been stuck on a problem that is driving me nuts.

Basically, I have conducted an experiment that and obtained two measurements from different devices at the same time. I am trying to show they correlate with each other.

We conducted this experiment in two positions (call it position A and B), and there was two phases of each experiment (phase 1 and 2).

So all up, both methods was measured in A1, A2, then B1 and B2.

I have managed to plot these on scatterplots, and get regression equations and correlations of each combination individually. What I would like to have is a graph that shows A1 and B1, their regression lines, and also the regression line if you combine the variable, so position C.

Any help with this would be appreciated.

Cheers,

Cas