There are other nonparametric techniques which make use of the scores attributed to
observations. Numerical scores, may not be from an underlying normal distribution but
may lend themseles to rank ordering. Rank order statistics, which use more information
contained in the data and are generally more powerful than nominal tests, may be used
with numerical scores that assign each observation to a relative position in the score
distribution. These rank order procedures are introduced in the next chapter.
Statistical analysis for education and psychology researchers 202