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ERIC Number: EJ1015339
Record Type: Journal
Publication Date: 2013-Sep
Pages: 19
Abstractor: As Provided
ISSN: ISSN-1098-2140
A Comparison of Model-Based and Design-Based Impact Evaluations of Interventions in Developing Countries
Hansen, Henrik; Klejnstrup, Ninja Ritter; Andersen, Ole Winckler
American Journal of Evaluation, v34 n3 p320-338 Sep 2013
There is a long-standing debate as to whether nonexperimental estimators of causal effects of social programs can overcome selection bias. Most existing reviews either are inconclusive or point to significant selection biases in nonexperimental studies. However, many of the reviews, the so-called "between-studies," do not make direct comparisons of the estimates. We survey four impact studies, all using data from development interventions that directly compare experimental and nonexperimental impact estimates. Our review illustrates that when the program participation process is well understood, and correctly modeled, then the nonexperimental estimators can overcome the selection bias to the same degree as randomized controlled trials. Hence, we suggest that evaluators of development programs aim to be careful and precise in the formulation of the statistical model for the assignment into the program and also to use the assignment information for model-based systematic sampling. (Contains 4 tables and 5 notes.)
SAGE Publications. 2455 Teller Road, Thousand Oaks, CA 91320. Tel: 800-818-7243; Tel: 805-499-9774; Fax: 800-583-2665; e-mail:; Web site:
Publication Type: Journal Articles; Information Analyses
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Mexico; New Zealand; Nicaragua; Tonga
Grant or Contract Numbers: N/A