Calculates the moving median of a series.
MOVMEDIAN(series, N, rampflag)
series 
 
A series or table.  
N 
 
An integer, the number of points to calculate the median as the series is processed.  
rampflag 
 
Optional. An integer, endpoint median flag.

A series or table.
W1: 1..5
W2: movmedian(W1, 3)
W3: movmedian(W1, 3, 0)
W2 == {1, 1.5, 2, 3, 4, 4, 5}
W3 == {0, 1, 2, 3, 4, 4, 0}
The moving median computation in W2 "ramps" up and down at the beginning and end of the series whereas the moving median computation of W3 assumes the series consists of 0 values before the beginning and after the end.
In particular, for series x of length N, movmedian(x, 3) returns the following N+2 length series:
If rampflag is 0, movmedian(x, 3, 0) returns the following N+2 length series:
For multicolumn series, MOVMEDIAN computes the moving median on each column.
See SORT for a description of the sorting algorithm used to compute the median of each segment.
See MEDIAN to compute the median of the entire series.
See BLOCKMEDIAN to compute the nonoverlapping block median of a series.