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Download full textStuart, Elizabeth A.; Olsen, Robert B.; Bell, Stephen H.; Orr, Larry L. – Society for Research on Educational Effectiveness, 2012
While there has been some increasing interest in external validity, most work to this point has been in assessing the similarity of a randomized trial sample and a population of interest (e.g., Stuart et al., 2010; Tipton, 2011). The goal of this research is to calculate empirical estimates of the external validity bias in educational intervention…
Descriptors: Validity, Bias, Computation, Outcome Measures
Zoblotsky, Todd; Ransford-Kaldon, Carolyn; Morrison, Donald M. – Society for Research on Educational Effectiveness, 2011
The present paper describes the recruitment and site selection process that has been underway since January 2011, with particular emphasis on the use of Mahalanobis distance score to determine matched pairs of sites prior to randomization to treatment and control groups. Through a systematic winnowing process, the authors found that they could…
Descriptors: Science Instruction, Educational Change, Research Methodology, Site Selection
Cook, William A. – United States Bureau of Education, Department of the Interior, 1915
With the increase of population, the lengthening of the school life of children, and the consolidation of small into large schools, often with many hundreds of children in one building, the care of the health of children while in school becomes correspondingly more important. Since the health of school children depends to a large extent on the…
Descriptors: Educational History, Elementary Secondary Education, Public Schools, Compulsory Education
