Non-Parametric Tests
At least one test must be selected. Type a list of letters containing the
first one or two letters that are capitalized. Consult a statistics text for
more information about each test.
SIgn test = The sign of the difference between pairs of values is noted.
The frequency of the least-frequent sign is compared with
the frequency expected by chance.
Wilcoxon = Like the SIgn test, but the absolute magnitude of the
differences between pairs are ranked. Ranks associated with
positive differences are compared with ranks aoociated with
negative differences.
FRiedman = Compares the average rank for each column with the average
rank for all the other columns.
KRusdal-Wallis= One-way analysis of variance on ranks. If there are only
two groups, then the Mann-Whitney U-statistic is also given.
KEndall and
SPearman = Correlations among ranks.
The data need not be ranks. P3S computes the ranks before proceding.