methods provide alternatives to classical analyses without
making the usual assumption that data come from a normal
distribution (or any other specific distribution).
STATGRAPHICS Centurion includes such methods in many of its
statistical procedures. Typically, the nonparametric
techniques are included as options in the procedures that
implement the parametric techniques, rather than being
lumped together in a separate menu.
Some of the nonparametric
procedures included are:
Analysis - sign test and signed rank test for
Comparison - Mann-Whitney (Wilcoxon) test and
two-sample Kolmogorov-Smirnov test.
Oneway Analysis of
Variance - Kruskal-Wallis and Friedman tests.
Analysis - Spearman and Kendall rank correlation