Here is a set of SAS macros for producing publication-ready spline plots.

This work was inspired by the GLMCURV9 macro by Donna Spiegelman et al. which can be found at: Harvard SPH. This set of macros relies on SAS procedures and functions that were not available when GLMCURV9 was written, most notably in that they don’t rely on PROC IML. These macros also do not rely on SASGRAPH procedures, instead using PROC SGPLOT and PROC SGPANEL for graphics displays.

Note also that these macros are not horribly complicated or long, so they should be readily modifiable by the user.

All of the macros are contained in a single SAS program which also includes graphics setup code as well as four macros that can produce spline plots for either PROC GLIMMIX [generalized linear models] or PROC PHREG [survival models] with either a single curve, or multiple curves with a stratifying/effect modifying variable.

There is a rather extensive README file, which describes the macros and shows sample output.

README Restricted Cubic Spline Plots

There is also the combined macro file, demo program and sample data set. The latest version can be found here along with other macros: https://people.bu.edu/gagnon/Macros.htm

These macros are released “as-is” and may be used freely.  Please reference this web page for attribution.