@Tohar , so it sounds like you have an ANCOVA model (one categorical factor C, and one continuous X) and you want to regress Y on these. Define Y100 = Y-100. then use Y100 as your response. then the only effect in your model will be C*X, with no intercept. See pic below. Also, in the red triangle pull down menu deselect "Center Polynomials".
![MRB3855_0-1684938574310.png MRB3855_0-1684938574310.png](https://community.jmp.com/t5/image/serverpage/image-id/53054iA6B0DD1FD9E39640/image-size/medium?v=v2&px=400)
Run this and get the following: And remember Y100 is Y-100. So, when Y100=0, Y=100. You can then get creative with Save Prediction Formula/Graph Builder/etc to get the Y axis back to the raw scale (shift it back up by 100).
![MRB3855_1-1684938625005.png MRB3855_1-1684938625005.png](https://community.jmp.com/t5/image/serverpage/image-id/53055i9922128DCEB87F39/image-size/medium?v=v2&px=400)