Generalizability of Randomized Trial Results to Target Populations: Design and Analysis Possibilities. (July 2018)

• Record Type: Journal Article
• Authors: Stuart, Elizabeth A.; Ackerman, Benjamin; Westreich, Daniel
• Other Names: Soydan Haluk guest-editor.
• Is Part Of: Research on social work practice. Volume 28:Number 5(2018)
• Page Start: 532
• Page End: 537
• Publication Date: 2018-07
• Subjects: literature review -- evidence-based practice; Social service -- Periodicals; 361.3205
• DOI: 10.1177/1049731517720730
• Languages: English
• ISSNs: 1049-7315

Abstract

Randomized trials play an important role in estimating the effect of a policy or social work program in a given population. While most trial designs benefit from strong internal validity, they often lack external validity, or generalizability, to the target population of interest. In other words, one can obtain an unbiased estimate of the study sample average treatment effect from a randomized trial; however, this estimate may not equal the target population average treatment effect if the study sample is not fully representative of the target population. This article provides an overview of existing strategies to assess and improve upon the generalizability of randomized trials, both through statistical methods and study design, as well as recommendations on how to implement these ideas in social work research.