OK, you got the part about clarks, scotts and rogers. You are comfortable with the primary characteristics of each of the three. What are you waiting for?  Get on out there!!

Here is the best way, today when you are in a public place, look around…do you see any overly-animated people? Running/walking fast/vibrating in place? scotts  
See that clique, that group of people that appear real friendly….see how they laugh after one of their group leaves?…roger
 clarks?  damn, around here somewhere…usually won’t be obvious