Using symbols in cells and then averaging those cells

Shawn Borror
Shawn Borror ✭✭
edited 12/09/19 in Smartsheet Basics

I have a portfolio level DB and am using health field symbols. I want those health field symbols to equal 1, 2, 3 and then take the average  to provide a program level health. 

I have tried this         

IF([Cell] = "Green", 3, IF([Cell] = "Yellow"), 2, IF([Cell] = "Red"), 1, "")))

But am getting unparseable error.