Linear Estimation on 41cv ?

[SteveMyers]

I am switching from my trusty 11C to a 41CV. (after 30+ years, the 11c is failing)
My 41CV has an Advantage Module, but one fuction I use alot is missing: Linear Estimation.

Today I ordered the complete library of manuals on USB from here thinking the answer will be in there somplace, but I'm hoping someone can help me out and tell me what module I need to find that has linear estimation so I can start the hunt now.

Is it in MATH I, MATH/STAT, STAT 1 or some other custom ROM?

Thanks!
S.M.