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Blocking (statistics) : ウィキペディア英語版 | Blocking (statistics)
In the statistical theory of the design of experiments, blocking is the arranging of experimental units in groups (blocks) that are similar to one another. ==Example== For example, an experiment is designed to test a new drug on patients. There are two levels of the treatment, ''drug'', and ''placebo'', administered to ''male'' and ''female'' patients in a double blind trial. The sex of the patient is a ''blocking'' factor accounting for treatment variability between ''males'' and ''females''. This reduces sources of variability and thus leads to greater precision.
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