Hi, I would like to use MAS5 in a batch of arrays where some probes are declared as missing but the function do not seems to accept missing values. Some sugestion ? Best -- Mayte Suarez Farinas The Rockefeller University 1230 York Avenue, Box 212 New York, NY 10021 phone: 1-212-327-8186 fax: 1-212-327-7422