Ivy League colleges have made few strides in hiring women and members of minority groups, according to a report released this week by a group of Yale University graduate students who are seeking to form a union. Data in the report, compiled from existing statistics at the U.S. Department of Education, show that of 433 new professors hired into tenure-track positions at Ivy League institutions in 2003, only 150 were women, 14 were black, and 8 were Hispanic.