Please e-mail comments and questions to Frank Sortino at: "bizprof@msn.com". Please include your name, e-mail address, phone number, and fax number in your e-mail.

If you have questions about papers we have published, please identify the title, page and paragraph that relates to your question. If you want to comment on a working paper, please specify working paper number or title. If you have a question about the models, please keep in mind that we are not set up to offer trouble shooting or customer support; that's why we have vendors who offer commercial versions of our models. We will try to answer questions having to do with the underlying theory and the inevitable bugs. Be sure to read the disclaimers on the "Models" page.