Columbia subject headings:
Eighth grade (Education)--United States--Longitudinal studies--Statistics.
Harvard subject headings:
Education, Elementary--United States--Longitudinal studies--Statistics.
Educational statistics.
Eighth grade (Education)--Longitudinal studies--Statistics.
Students--United States--Longitudinal studies--Statistics.
Princeton subject headings:
Education, Elementary--United States--Longitudinal studies.
Educational statistics.
Eighth grade (Education)--Longitudinal studies.
Students--United States--Longitudinal studies.