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ERIC Number: ED562830
Record Type: Non-Journal
Publication Date: 2014
Pages: 9
Abstractor: ERIC
Reference Count: 4
Theoretical and Empirical Underpinnings of the What Works Clearinghouse Attrition Standard for Randomized Controlled Trials
Deke, John; Chiang, Hanley
Society for Research on Educational Effectiveness
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 existing standards and for anyone interested in adopting this approach to developing a standard (that is, combining a theoretical model with empirical estimates of key parameters) in a new context. The purpose of this paper is to explain the WWC attrition model, the process for selecting key parameter values for that model, and how the model informed the development of the WWC attrition standard and can be used to develop attrition standards tailored to other substantive areas. The model of attrition bias presented here, and the standard based on it, is an effort to protect consumers of research from drawing mistaken conclusions because of bias (in this case, attrition bias) in impact estimates. Tables and figures are appended.
Society for Research on Educational Effectiveness. 2040 Sheridan Road, Evanston, IL 60208. Tel: 202-495-0920; Fax: 202-640-4401; e-mail:; Web site:
Publication Type: Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: Society for Research on Educational Effectiveness (SREE)