Hi everyone,
I've got 5 multiple linear regression models, each with 3 independent variables. Thats all ok.
Problem is when I plot the predicted values using the equations, against the dependent data that the equations were based on, it seems to be underestimating the values. For all 5 of the models.
Shouldn't the predicted values run through the centre of the scatter of dependent variables? What is the reason for this?

Thanks for your help.
Luke