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Ingels, Steven J.; Owings, Jeffrey A. – 1994
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…
Descriptors: Attrition (Research Studies), Change, Cohort Analysis, Eligibility
Ingels, Steven J. – 1993
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…
Descriptors: Attrition (Research Studies), Disabilities, Educational Assessment, Educational Change