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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


Full Text
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
License