Mann-Whitney U – similar to Wilcoxon matched-paired signed-ranks test except that the samples are independent and not paired.
Kolmogorov-Smirnov – to test if two distributions are different. It is used when there are only a few values available on the ordinal scale. K-S test is more powerful than M-W U test if the two distributions differ in terms of dispersion instead of central tendency.
Wald-Wolfowitz Run – test if two distributions are different in dispersion instead of different in central tendency
Moses test of extreme reactions – used when an experimental condition will cause some subjects to show extreme behaviour in one direction while it causes others to show extreme behaviour in the opposite direction. For instance, there are theoretical reasons to predict that “perceptual defense” may manifest itself in either an extremely rapid “vigilant” perceptual response or an extreme slow “repressive” perceptual response.