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Download full textWilliams, John Delane – 1991
Missing data for a given cohort of students in a longitudinal study occurs for at least two reasons: either the student has moved or otherwise become unavailable for testing, or the cohort was not in the testing range at a given testing time. A developmental sampling for time of testing x cohort x grade research plan of testing is used to…
Descriptors: Age, Cohort Analysis, Educational Testing, Elementary Education
