Psycometrics perf benchmarks
I believe ab-inito group performance is compared against ab-initio benchmarks and DEP against DEP...age is factored in and relative performance of agegroup world wide is used as a benchmark.That is what Madame Mkenya(the mzungu is a Kenyan) meant you are not competing against each other.I asked this question specifically during the tests both in Psychometrics and Psychomotor and got a consistent answer.I also happen to have read much on the Psychology of Aviation Test Battery which has evolved since world war 2 in europe..its not a new thing.
There is no 100% proof that these test results portray accurate pilot aptitude and abilities.I can not prove it on this forum but I have proof.It is more of a statistical excercise to conveniently categorise approximate findings of certain known personality traits in a test group controlled conditions.