How to generate a regression curve for a binary dependent variable

[LiHZ]

Hi everyone, Please bear with me.

I'm confused to finish this model alone.

There is a discrete independent variable and a binary dependent variable (percentage).

I can use proc glimmix to generate the figure below. But how can i generate a regression curve by  Legendre polynomials like in the second figure?

[sbxkoenk]

Hello,

I think you can fit a spline if you just want to know about the overall "trend".

If you want Legendre (orthogonal) polynomials, they are in SAS/IML ORPOL Function.

Good luck,

Koen

 

[StatDave]

See this note that (in addition to estimating odds ratios) shows fitting a quadratic or spline model and producing a plot.

[Rick_SAS]

If you fit a curve, then you are assuming that the independent variable (group) is continuous. But you said it is discrete. So which is it?