Social Complexity and Agility
January 12th, 2009

log(N) = 0.093 + 3.389 log(CR) (1) (r2=0.764, t34=10.35, p<0.001), or 147.8 friends

What’s that wierd formula in the title? It’s the best-fit reduced major axis regression equation between neocortex ratio and mean group size for the sample of 36 primate genera taken from Robin Dunbar’s 1992 paper, and which is normally interpreted as being a natural limit on human group size of 150 (or 147.8 to be [...]