Some authors have recently warned against preliminary testing [24,36-45]. First of all, theoretical drawbacks exist with regard to the preliminary testing of assumptions. The basic difficulty of a typical pretest is that the
desired result is often the acceptance of the null hypothesis.In practice, the conclusion about the validity of, for
example, the normality assumption is then implicit rather than explicit: Because insufficient evidence exists to
reject normality, normality will be considered true. In this context, Schucany and Ng [41] speak about a “logical
problem”.