Sample undercoverage issues in the National Education Longitudinal Study of 1988 (NELS:88) are addressed. The main focus is the exclusion of certain categories of student in the base year, 1988, and in in-school follow-up rounds. A subsidiary focus is the question of how adequately transfer students were captured within the sampling procedures of…

The National Education Longitudinal Study of 1988 (NELS:88) serves as an example of how three specific problems of representativeness in a longitudinal study may be approached and overcome. NELS:88 was designed to provide longitudinal data about the educational transitions experienced by students as they leave eighth grade and move through high…

Recent investigations of the extent to which students with disabilities are allowed to participate in major national data collections used in measurement-driven education reform suggest that 40 to 50 percent of students with disabilities are typically excluded from major assessments, although they are included to a greater degree in assessments…