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Download full textWhat Works Clearinghouse, 2017
The What Works Clearinghouse (WWC) uses the term "baseline equivalence" when determining if the intervention group (those that received the intervention of interest) and the comparison group (those that did not receive the intervention) had characteristics that were similar enough ("equivalent") at the start of the study (at…
Descriptors: Control Groups, Experimental Groups, Intervention, Comparative Analysis
What Works Clearinghouse, 2017
"Attrition" is the loss of sample during the course of a study. It occurs when individuals initially randomly assigned in a study are not included when researchers examine the outcome of interest. Attrition is a common issue in education research, and it occurs for many reasons. The What Works Clearinghouse (WWC) is an initiative of the…
Descriptors: Attrition (Research Studies), Control Groups, Experimental Groups, Randomized Controlled Trials
Direct linkPietsch, Renée B.; Hanlon, Regina; Bohland, Cynthia; Schmale, David G., III – Science Teacher, 2016
This article describes an interdisciplinary unit in which students explore biological "ice nucleation"--by particles that cause water to freeze at temperatures above -38°C--through the lens of the microbial ice nucleator "Pseudomonas syringae." Such This activity, which aligns with the "Next Generation Science…
Descriptors: Science Instruction, Interdisciplinary Approach, Experimental Groups, Units of Study
Deke, John; Constantine, Jill – Society for Research on Educational Effectiveness, 2011
Regression discontinuity designs (RDDs) are considered to be one of the strongest nonexperimental designs available for the purpose of identifying the effects of an intervention. RDD can be used in situations in which assignment to a treatment group is based on a cutoff value on a continuous assignment variable. The impact of the intervention is…
Descriptors: Educational Research, Intervention, Context Effect, Identification
