“…To prove that one dimension biases or does not bias some or all the measurements for another dimension requires evidence of (individual gradation by individual gradation: see Krause, 2010) causation of bias and not merely of correlation, and this requires a research program of its own, one which includes the development of a definitionally valid (and so itself unbiased) measure for the suspected biasing dimension. Such a research program would far exceed the usual efforts in psychological research for dealing with measurement bias, which—for example—uses unvalidated response-set detector items (e.g., Berg, 1967; Campbell, 1996; Edwards, 1990; Krause, 1965; Nicholson & Hogan, 1990; Walsh, 1990) or uses unvalidated projective tests (e.g., Sundberg, 1977, 201–226).…”