expressions: Implement the MEDIAN function.

[pspp] / doc / expressions.texi

diff --git a/doc/expressions.texi b/doc/expressions.texi
index b7e23a5f96c3d0721a4614832a09292a47bd67e9..e468b8750ac457361b878a7788ac24e6d0e8a544 100644 (file)
--- a/doc/expressions.texi
+++ b/doc/expressions.texi
@@ -262,7 +262,7 @@ The sections below describe each function in detail.
 * Trigonometry::                ACOS ARCOS ARSIN ARTAN ASIN ATAN COS SIN TAN
 * Missing Value Functions::     MISSING NMISS NVALID SYSMIS VALUE
 * Set Membership::              ANY RANGE
-* Statistical Functions::       CFVAR MAX MEAN MIN SD SUM VARIANCE
+* Statistical Functions::       CFVAR MAX MEAN MEDIAN MIN SD SUM VARIANCE
 * String Functions::            CONCAT INDEX LENGTH LOWER LPAD LTRIM NUMBER 
                                 REPLACE RINDEX RPAD RTRIM STRING SUBSTR UPCASE
 * Time and Date::               CTIME.xxx DATE.xxx TIME.xxx XDATE.xxx
@@ -510,6 +510,13 @@ be numeric or string.
 Results in the mean of the values of @var{number}.
 @end deftypefn
 
+@cindex median
+@deftypefn {Function} {} MEDIAN (@var{number}, @var{number}[, @dots{}])
+Results in the median of the values of @var{number}.  Given an even
+number of nonmissing arguments, yields the mean of the two middle
+values.
+@end deftypefn
+
 @cindex minimum
 @deftypefn {Function} {} MIN (@var{number}, @var{number}[, @dots{}])
 Results in the value of the least @var{value}.  The @var{value}s may