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| Control Groups | 1 |
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| Rubin, Donald | 1 |
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Download full textRubin, Donald – 1972
Matching, randomization, random sampling, and other methods of controlling extraneous variation are discussed. The purpose was to specify the benefits of randomization in estimating causal effects of treatments. It is concluded that randomization should be employed whenever possible, but the use of carefully controlled nonrandomized data to…
Descriptors: Control Groups, Definitions, Evaluation Methods, Experimental Groups
