Chisala has his 3rd installment up: http://www.unz.com/article/closing-the-black-white-iq-gap-debate-part-3/ One idea I had while reading it was that tail effects interact with population ethnic/racial heterogeneity. To show this, I did a simulation experiment. Population 1 is a regular population with a mean of 0 and sd of 1. Population 2 is a composite population of three sub-populations: one with a mean of 0 (80%; "normals") one with mean of -1 (10%; "dullards") and one with a mean of 1 (10%; "brights"). Population 3 is a normal population but with a slightly increased sd so that it is equal to the sd of population 2.
Ethnic heterogeneity and tail effects
Ethnic heterogeneity and tail effects
Ethnic heterogeneity and tail effects
Chisala has his 3rd installment up: http://www.unz.com/article/closing-the-black-white-iq-gap-debate-part-3/ One idea I had while reading it was that tail effects interact with population ethnic/racial heterogeneity. To show this, I did a simulation experiment. Population 1 is a regular population with a mean of 0 and sd of 1. Population 2 is a composite population of three sub-populations: one with a mean of 0 (80%; "normals") one with mean of -1 (10%; "dullards") and one with a mean of 1 (10%; "brights"). Population 3 is a normal population but with a slightly increased sd so that it is equal to the sd of population 2.