[ /SIGN var_list [ WITH var_list [ (PAIRED) ]]]
The /SIGN subcommand tests for differences between medians of the
variables listed.
The test does not make any assumptions about the
distribution of the data.
If the WITH keyword is omitted, then tests for all
combinations of the listed variables are performed.
If the WITH keyword is given, and the (PAIRED) keyword
is also given, then the number of variables preceding WITH
must be the same as the number following it.
In this case, tests for each respective pair of variables are
performed.
If the WITH keyword is given, but the
(PAIRED) keyword is omitted, then tests for each combination
of variable preceding WITH against variable following
WITH are performed.