Documentation for the Friedman test

[pspp-builds.git] / doc / statistics.texi

diff --git a/doc/statistics.texi b/doc/statistics.texi
index c475f306b3644431b9e248e629b6e04b8b550b3b..7e7d9c05eeaa8a300cefd78dc0a549699ffe7b93 100644 (file)
--- a/doc/statistics.texi
+++ b/doc/statistics.texi
@@ -681,7 +681,10 @@ is used.
 @menu
 * BINOMIAL::                Binomial Test
 * CHISQUARE::               Chisquare Test
+* FRIEDMAN::                Friedman Test
+* KRUSKAL-WALLIS::          Kruskal-Wallis Test
 * WILCOXON::                Wilcoxon Signed Ranks Test
+* RUNS::                    Runs Test
 * SIGN::                    The Sign Test
 @end menu
 
@@ -762,6 +765,44 @@ sum of the frequencies need not be 1.
 If no /EXPECTED subcommand is given, then then equal frequencies 
 are expected.
 
+
+@node FRIEDMAN
+@subsection Friedman Test
+@vindex FRIEDMAN
+@cindex Friedman test
+
+@display
+     [ /FRIEDMAN = varlist ]
+@end display
+
+The Friedman test is used to test for differences between repeated measures when there is no indication that the distributions are normally distributed.
+
+A list of variables which contain the measured data must be given.  The procedure prints the sum of ranks for each variable, the test statistic and its significance.
+
+@node KRUSKAL-WALLIS
+@subsection Kruskal-Wallis Test
+@vindex KRUSKAL-WALLIS
+@vindex K-W
+@cindex Kruskal-Wallis test
+
+@display
+     [ /KRUSKAL-WALLIS = varlist BY var (lower, upper) ]
+@end display
+
+The Kruskal-Wallis test is used to compare data from an 
+arbitrary number of populations.  It does not assume normality.
+The data to be compared are specified by @var{varlist}.
+The categorical variable determining the groups to which the
+data belongs is given by @var{var}. The limits @var{lower} and
+@var{upper} specify the valid range of @var{var}. Any cases for
+which @var{var} falls outside [@var{lower}, @var{upper}] will be
+ignored.
+
+The mean rank of each group as well as the chi-squared value and significance
+of the test will be printed.
+The abbreviated subcommand  K-W may be used in place of KRUSKAL-WALLIS.
+
+
 @node WILCOXON
 @subsection Wilcoxon Matched Pairs Signed Ranks Test
 @comment  node-name,  next,  previous,  up
@@ -789,6 +830,25 @@ If the @code{WITH} keyword is given, but the
 of variable preceding @code{WITH} against variable following
 @code{WITH} are performed.
 
+@node RUNS
+@subsection Runs Test
+@vindex RUNS
+@cindex runs test
+
+@display 
+     [ /RUNS (@{MEAN, MEDIAN, MODE, value@}) varlist ]
+@end display
+
+The /RUNS subcommand tests whether a data sequence is randomly ordered.
+
+It works by examining the number of times a variable's value crosses a given threshold. 
+The desired threshold must be specified within parentheses.
+It may either be specified as a number or as one of MEAN, MEDIAN or MODE.
+Following the threshold specification comes the list of variables whose values are to be
+tested.
+
+The subcommand shows the number of runs, the asymptotic significance based on the
+length of the data.
 
 @node SIGN
 @subsection Sign Test