Hi all,
The Col Rank function does now support BY variables as was originally requested. It looks like full support was added in the JMP 13 timeframe, so if you're using that version or a more recent one, you should be able to do this.
The online JMP Help gives a few more details and tie-break options:
https://www.jmp.com/support/help/en/15.1/#page/jmp/statistical-functions-2.shtml?os=win&source=appli...
I know this is an older thread, but wanted this information available for anyone else who may be looking for it.
Cheers!
Audrey