Hi @paulp,
Not directly related to your question, but did you try the Wavelets models family for your spectroscopic data ?
If not, I would considere giving it a try, as it performs quite well on spectral data.
Concerning the MCR, I can't help you since I don't seem to have this option (yet), I'm with JMP Pro 17.2.0 version and MCR seems to be an option from JMP 18.
Maybe someone from JMP technical staff could help you figure out where does the error comes from : @Bill_Worley, @JeremyAshJMP @chris_gotwalt1 ?
Victor GUILLER
L'Oréal Data & Analytics
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)