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David Weisburd, Charlotte Gill, Block Randomized Trials at Places: Rethinking the Limitations of Small N Experiments, Journal of Quantitative Criminology, Vol. 30, No. 1 (March 2014), pp. 97-112 ...
In many experimental situations, a response surface design is divided into several blocks to control an extraneous source of variation. The traditional approach in most response surface applications ...