The Trim and Winsorize commands can be used to eliminate extreme points in a data set.

The Trim command return all points from X between lth and uth percentiles.

The Winsorize command is similar to Trim except that the extreme points in X are replaced with the values of the lth or the uth percentile (whichever is closer).

The first parameter X is the data set, which must be a one-dimensional rtable (e.g. Array or Vector).

The second parameter l is the lower percentile, the third parameter u is the upper percentile. Note, that both l and u must be numeric constants between 0 and 100. A common choice for l and u is 5 and 95 respectively.