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Experimental methods for impact evaluation

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Frame of Image h an alternative project (counterfactual) ▪ To do this, we want to compare outcomes of the ‘treated’ group to a ‘control’ group ▪ Randomly selecting treatment and control groups is the “gold standard” Is this the impact of a project? Intervention: Introduce high-yield variety of maize Outcome of interest: Improve maize yields (kgs/ha) 7 6 5 4 3 2 1 0 Before Treatment Group After The importance of a control group 7 6 5 4 3 2 1 (+) Impact of the program (+) Impact of other factors 0 Before Control Group After Treatment Group The importance of a control group 7 6 5 4 3 2 1 0 Before After (+) Impact of the program (-) Impact of other factors Control Group Treatment Group Counterfactual analysis Ideal Compare same individual with & without project This is impossible! Instead Identify a control group that is similar in all ways except project participation Measure treatment group outcomes and compare to control group to evaluate project impact What makes a good control? ▪ Treatment and control need to be as similar as possible ▪ Can we compare people who received the project to anyone who didn’t receive the project? ▪ What was the reason that some people received it and others didn’t? ▪ Selection bias is important to understand ▪ Projects started at specific times and places for particular reasons ▪ Participants may self-select into programs Randomization is gold standard ▪ Randomly assign potential beneficiaries to treatment or control group ▪ By design, treatment and control have


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Title Experimental methods for impact evaluation
Similar Titles
Material Type Proceeding
Author(English)

Jones, Maria

Publisher

KDI School; World Bank DIME
Date 2020-10
Event KDI school - World bank DIME conference on impact evaluation in governance and finance
Series Title; No KDI School-World Bank DIME Conference on Impact Evaluation in Governance and Finance
Pages 31
Subject Country United States(Americas)
Language English
File Type Documents
Original Format pdf
Subject Industry and Technology < Science/Technology
Holding KDI School of Public Policy and Management
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