XploRe Help : median

Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Group:	Statistical Data Analysis
Topic:	Basic Statistics
See also:	mean sum var

Function:		median
Description:		Computes the empirical medians of a given array.

Usage:	`median = median (x {, j})`
Input:
	`x`	d1 x d2 x .. x dn array
	`j`	integer (for faster median, default 0)
Output:
	`median`	1 x d2 x .. x dn array - for each column in x the empirical medians

Note:

Any non-zero number as the optional parameter causes for even number of observations faster computing - the median is simply aproximated by the (# of elements)/2 th element (possible to use for samples greater than 100 only).

Example:

randomize(0) x = normal(200, 3) median(x)

Result:

Contents of median
[1,] -0.063414 -0.040036  0.062863

Example:

randomize(0) x = normal(200, 3) x[1,1:2] = NaN x[2,1] = NaN median(x)

Result:

Contents of median
[1,]     +NAN     +NAN  0.062863