SDREJECT   Add reject option to a trained pipeline

     PR=SDREJECT(P,DATA,options)

 INPUT
    P       Trained pipeline
    DATA    Training data set used to adjust rejection threshold

 OUTPUT
    PR      Pipeline P with added decision operating point

 OPTIONS
    'reject'   Reject fraction (optional, default=0.01)

 DESCRIPTION
 SDREJECT adds rejection to a trained pipeline P including rejection
 threshold to the weighting-based operating point (discriminant).  If P
 returns soft outputs, default operating point with equal per-class
 weights is used. If P returns decisions, the weights of its current
 operating point are adopted.
 SDREJECT uses data set DATA to adjust the rejection threshold. By
 default, 1% of DATA is rejected. Reject fraction may be adjusted using
 the 'reject' option.

 READ MORE
 http://perclass.com/doc/guide/ROC_analysis.html#reject

sdreject is referenced in examples:

• kb18: How to protect a trained discriminant against outliers?