In Pursuit of Balance: Randomization in Practice in Development Field Experiments
American Economic Journal: Applied Economics
vol. 1,
no. 4, October 2009
(pp. 200-232)
Abstract
We present new evidence on the randomization methods used in existing experiments, and new simulations comparing these methods. We find that many papers do not describe the randomization in detail, implying that better reporting is needed. Our simulations suggest that in samples of 300 or more, the different methods perform similarly. However, for very persistent outcome variables, and in smaller samples, pair-wise matching and stratification perform best and appear to dominate the rerandomization methods commonly used in practice. The simulations also point to specific recommendations for which variables to balance on, and for which controls to include in the ex post analysis. (JEL C83, C93, O12)Citation
Bruhn, Miriam, and David McKenzie. 2009. "In Pursuit of Balance: Randomization in Practice in Development Field Experiments." American Economic Journal: Applied Economics, 1 (4): 200-232. DOI: 10.1257/app.1.4.200Additional Materials
JEL Classification
- C83 Survey Methods; Sampling Methods
- C93 Field Experiments
- O12 Microeconomic Analyses of Economic Development
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