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Direct linkLuke Miratrix; Ben Weidmann – Society for Research on Educational Effectiveness, 2022
Background/Context: Attrition has been described as "the Achilles Heel of the randomized experiment" (Shadish et al., 1998 p.3). Attrition looms as a threat because it can undermine group equivalence, eroding the methodological strength at the heart of a randomized evaluation. In particular, attrition could result in unobserved…
Descriptors: Educational Research, Statistical Bias, Attrition (Research Studies), Computation
Mark Fredrickson; Ben B. Hansen – Society for Research on Educational Effectiveness, 2021
Context: Assessments of baseline equivalency of intervention and control groups, "balance," play a critical role in evaluating educational interventions. The highest What Works Clearinghouse (WWC) of the Institute of Educational Studies (IES) standard for educational studies, "Meets WWC Design Standards Without Reservations,"…
Descriptors: Educational Research, Experimental Groups, Control Groups, Intervention
Download full textDeke, John; Wei, Thomas; Kautz, Tim – Society for Research on Educational Effectiveness, 2018
Evaluators of education interventions increasingly need to design studies to detect impacts much smaller than the 0.20 standard deviations that Cohen (1988) characterized as "small." For example, an evaluation of Response to Intervention from the Institute of Education Sciences (IES) detected impacts ranging from 0.13 to 0.17 standard…
Descriptors: Intervention, Program Evaluation, Sample Size, Randomized Controlled Trials
Rickles, Jordan; Zeiser, Kristina – Society for Research on Educational Effectiveness, 2017
This paper describes and demonstrates a new online resource developed to help researchers proactively plan for student attrition: the Student Attrition Lookup Tool (SALT). With SALT, researchers can access student mobility estimates for different student and school subpopulations and for different transition periods from kindergarten to grade 12.…
Descriptors: Student Attrition, Attrition (Research Studies), Elementary Secondary Education, Educational Research
Deke, John; Chiang, Hanley – Society for Research on Educational Effectiveness, 2014
Meeting the What Works Clearinghouse (WWC) attrition standard (or one of the attrition standards based on the WWC standard) is now an important consideration for researchers conducting studies that could potentially be reviewed by the WWC (or other evidence reviews). Understanding the basis of this standard is valuable for anyone seeking to meet…
Descriptors: Attrition (Research Studies), Student Attrition, Randomized Controlled Trials, Standards
Dong, Nianbo; Lipsey, Mark W. – Society for Research on Educational Effectiveness, 2011
Attrition occurs when study participants who were assigned to the treatment and control conditions do not provide outcome data and thus do not contribute to the estimation of the treatment effects. It is very common in experimental studies in education as illustrated, for instance, in a meta-analysis studying "the effects of attrition on baseline…
Descriptors: Attrition (Research Studies), Educational Research, Scientific Methodology, Research Design
