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Direct linkTipton, Elizabeth; Hedges, Larry; Vaden-Kiernan, Michael; Borman, Geoffrey; Sullivan, Kate; Caverly, Sarah – Journal of Research on Educational Effectiveness, 2014
Randomized experiments are often seen as the "gold standard" for causal research. Despite the fact that experiments use random assignment to treatment conditions, units are seldom selected into the experiment using probability sampling. Very little research on experimental design has focused on how to make generalizations to well-defined…
Descriptors: Probability, Inferences, Eligibility, Recruitment
Download full textWillis, John A. – 1993
Kanawha County (West Virginia) schools use Z-scores to identify elementary students eligible for Chapter 1 services in reading and mathematics. A probit analysis of over 500 previously served students was used to determine the variables and weights in the Z-score equations. Independent variables were chosen from those commonly used to identify…
Descriptors: Compensatory Education, Educationally Disadvantaged, Elementary Education, Elementary School Students
Rosenblatt, Richard D. – 1979
The effectiveness of the Elementary and Secondary Education Act Title I reading and mathematics laboratories were evaluated to assess the improvement of underachieving elementary school students' academic skills. Laboratory students were selected on the basis of academic (rather than socioeconomic) criteria in grades 2 through 5; the control…
Descriptors: Achievement Gains, Achievement Tests, Analysis of Covariance, Compensatory Education
