Hello I am interested in exploring classification trees with suitable statistical software. I understand that SPSS provides an add-on module for this purpose, but the additional annual cost to my institution for this module would be £450. Has anyone had successful experience of using alternative software in connection with classification trees, where an additional fee was not involved? Best wishes Margaret --------------------------------- Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your freeaccount today.