Hi,
I have monthly data on X and Y since 2005 till now.
I would like to solve for the coefficient (b and a) of regressing y on x using the equation below. I came across a function called PROC NLMIXED in SAS but I am not quite sure that is a right function for me to use to solve for b and a in the following equation. Thanks a lot for your help!
![image.png image.png](https://communities.sas.com/t5/image/serverpage/image-id/26584i8E04372A2DCA52DA/image-size/medium?v=v2&px=400)
X in the case is bounded between 0 and c