NOTE: Standard errors of the estimates appear in parentheses. Curriculum levels are based on the number of credits and the types of courses graduates take.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, High School Transcript Study (HSTS), 2005.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, High School Transcript Study (HSTS), various years, 1990-2005.