  15.10.11 Runs Test       [ /RUNS ({MEAN, MEDIAN, MODE, value})
= var_list ]  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.