Which path do you intend to take, Nell?' said the Constable, sounding very interested. 'Conformity or rebellion?' Neither one. Both ways are simple-minded - they are only for people who cannot cope with contradiction and ambiguity.
And so, you can do hundreds and hundreds of studies showing a general factor and just so long as you restrict your populations, your testing materials and the kinds of situations you look at, you can keep finding the same wrong thing again and again.