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Do we really need both of these tags? They seem very close to me.

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    $\begingroup$ They seem close to me too, & I'd be OK w/ it if they were merged. However, I do see them as being potentially distinct; power is a property of a test, whereas power-analysis is an activity. Eg, the distinction might be clearer in this thread: Power of the t-test under unequal sample sizes, which is tagged [power-analysis], but should probably be tagged [power] instead under my way of thinking (I deferred to the OP, however). $\endgroup$ Sep 29 '13 at 15:06
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    $\begingroup$ Power could be the master. That would include the property and the activity (i.e. the analysis aspect would be implied in question body) $\endgroup$ Sep 29 '13 at 16:34
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As some people have stated in the comments, I think 'power' is the more appropriate parent, as there are some questions that pertain to power, like the power of a particular test, or what a given power implies, whereas 'power analysis' is something you do to a particular study.

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