Be sure to create the lag unconditionally, even if you use the value conditionally.   Be sure to read the documentation. If you have expectations on the behavior of lag as a matrix operator, you will find that they don't apply to a function in a general language like the SAS DATA step. https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/lefunctionsref/n0l66p5oqex1f2n1quuopdvtcjqb.htm ... View more

Try adding PLOTS=MATRIX(NVARS=ALL) to your proc statement.     https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/procstat/procstat_corr_syntax01.htm#procstat.corr.plotsopt ... View more

Every customization, of which I was aware that customers wanted before I retired, is illustrated in this chapter. https://support.sas.com/documentation/onlinedoc/stat/151/kaplan.pdf ... View more

Your trace output has mclinesinfo and mclinesrange but not mclines. You need to specify the exact names that GLM uses. ... View more

https://documentation.sas.com/doc/en/statcdc/14.2/statug/statug_transreg_details02.htm   ... View more

The KM plot modification work was a work in progress for many years. If you search all the sites mentioned in the reply, you will find old conference papers and other obsolete material. The last set of work is the SAS/STAT 15.1 chapter. https://support.sas.com/documentation/onlinedoc/stat/151/kaplan.pdf . I believe this is the final word on this topic (at least from SAS) as there is no one left there to work on it any more. In that final chapter, I wrote about every user-requested graph modification of which I was informed.   Also, independent of my work, Jefferey Meyers has done some great work on this topic. ... View more

https://support.sas.com/documentation/onlinedoc/stat/151/kaplan.pdf   If you are customizing the Kaplan-Meier plot, you should know about this chapter. ... View more

Use symputx not symput. The former is designed to do automatic numeric to character conversions. ... View more

@Ksharp Sorry, but it is the other way around. ... View more

If you are a novice at SAS, why would you assert that SAS, written by professional statisticians, is producing incorrect results? Where did you input your COUNT variable into the analysis? You did not. Look at the documentation and figure out how you add that variable. SAS is producing correct results. This is a user error. ... View more

Opscal functionality is also available from the SAS/STAT procedure transreg. ... View more

Check out the OPSCAL function in IML. It can average adjacent categories to achieve monotonicity.  https://documentation.sas.com/doc/en/pgmsascdc/v_045/casimllang/casimllang_common_sect279.htm ... View more

https://documentation.sas.com/doc/da/vdmmlcdc/8.1/lefunctionsref/n1e21rr6al5m2nn19r1fat5qxwrt.htm#:~:text=Removes%20leading%20and%20trailing%20blanks%2C%20and%20returns%20a%20concatenated%20character%20string.&text=Restriction%3A,%2C%20and%20MBCS%20(UTF8).   ... View more

Adding to the other comments. Don't use the macro language when you can use ordinary SAS code. I wrote some multi-thousand line macros in my day. Of course they had macro code. That said, when ever possible, I used DATA _NULL_ DATA step code to process parameters and strings. It makes your life much easier. ... View more