So, I struggle with Regression a lot. I just found out how to get 2 lines with the same slope, but I cannot manage to get 2 lines with the same intercept. I read about ANCOVA a lot (because I thought this was what I needed), but no one uses the same intercepts; just the same slope. Can someone help out with this?
migrated from stackoverflow.com Oct 11 '12 at 19:31