In my rush to post up the Expert Opinion findings presented yesterday by Rindermann et al, I realise I gave the old 1984 figures for test bias. The newer figures are somewhat lower, a score of 1.86 overall being found, where 1 is an insignificant amount, and 4 is a large amount. Sorry about that. It seems that Jensen (1980) “Bias in mental testing “ has had an educational effect after all. To those of you who queried it, fear not. The experts are responding to rational arguments.
Similarly, in the relevant comparisons the contemporary experts see less bias against groups, about 2 and a bit out of 9, though they certainly feel that all immigrants might be at a disadvantage. Jensen had a rule of thumb that immigrants should have 5 years to learn the local ways before it was valid to test them.
So, in summary, there is acknowledgment that the issue of test bias has been worked on, and has been reduced. Test producers now have to meet legal standards for item analysis, and there is double-sampling of minorities so as to achieve better confidence levels.