U.S. Department of Education, National Center for Education Statistics United States policymakers have targeted reducing STEM attrition in college, arguing that retaining more students in STEM fields in college is a low-cost, fast way to produce the STEM professionals that the nation needs (President’s Council of Advisors on Science and Technology [PCAST] 2012). Within this context, this Statistical Analysis Report (SAR) presents an examination of students’ attrition from STEM fields over the course of 6 years in college using data from the 2004/09 Beginning Postsecondary Students Longitudinal Study and the associated 2009 Postsecondary Education Transcript Study.