Dear R users, I'm using the rpart package to build classification trees. I'm interested in implementing the ordered Twoing as a splitting criterion. Does anyone have experience with this task ? Thank you for your help Paolo Paolo Radaelli Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali Facolt? di Economia Universit? degli Studi di Milano-Bicocca Via Bicocca degli Arcimboldi, 8 20126 Milano Italy e-mail paolo.radaelli at unimib.it Tel +39 02 6448 3163 Fax +39 02 6448 3105