<p><a href="https://stats.stackexchange.com/questions/tagged/sample-size" class="post-tag" title="show questions tagged &#39;sample-size&#39;" rel="tag">sample-size</a> is one of our most popular tags (54th), categorizing 232 threads as of July 14, 2013.  However, the topic <em>sample size</em> is very broad and not very distinctive, in my opinion.  There are a number of other tags that are related to this topic or overlap some aspects of the topic, including:  </p>

<ul>
<li><a href="https://stats.stackexchange.com/questions/tagged/small-sample" class="post-tag" title="show questions tagged &#39;small-sample&#39;" rel="tag">small-sample</a> (<a href="https://stats.stackexchange.com/tags/small-sample/info">tag wiki</a>)  </li>
<li><a href="https://stats.stackexchange.com/questions/tagged/big-data" class="post-tag" title="show questions tagged &#39;big-data&#39;" rel="tag">big-data</a> (<a href="https://stats.stackexchange.com/tags/big-data/info">tag wiki</a>)  </li>
<li><a href="https://stats.stackexchange.com/questions/tagged/large-data" class="post-tag" title="show questions tagged &#39;large-data&#39;" rel="tag">large-data</a> (<a href="https://stats.stackexchange.com/tags/large-data/info">tag wiki</a>)  </li>
<li><a href="https://stats.stackexchange.com/questions/tagged/power-analysis" class="post-tag" title="show questions tagged &#39;power-analysis&#39;" rel="tag">power-analysis</a> (<a href="https://stats.stackexchange.com/tags/power-analysis/info">tag wiki</a>)  </li>
<li><a href="https://stats.stackexchange.com/questions/tagged/power" class="post-tag" title="show questions tagged &#39;power&#39;" rel="tag">power</a> (<a href="https://stats.stackexchange.com/tags/power/info">tag wiki</a>)  </li>
<li><a href="https://stats.stackexchange.com/questions/tagged/underdetermined" class="post-tag" title="show questions tagged &#39;underdetermined&#39;" rel="tag">underdetermined</a> (<a href="https://stats.stackexchange.com/tags/underdetermined/info">tag wiki</a>)  </li>
</ul>

<p>At present the <a href="https://stats.stackexchange.com/tags/sample-size/info">tag wiki excerpt</a> for sample-size reads:  </p>

<blockquote>
  <p>Use this tag for questions where it is desired to know an appropriate
  sample size to perform a test or analysis or when the sample size is
  relevant to the question.</p>
</blockquote>

<p>I'm not sure this provides the ideal guidance on the use of the tag.  It seems to me that if someone is trying to figure out what sample size they need for their study, the most appropriate tag might be <code>power-analysis</code>, although I can also see how someone might say that tag should only be used for questions <em>about</em> power analyses (say, the difference between a-priori and post-hoc power analyses) instead.  </p>

<p>Moreover, skimming down the list of questions tagged with <code>sample-size</code>, perhaps about half are tagged with one of the above as well, and it's not clear what having the tag <code>sample-size</code> in addition adds.  There are, of course, cases where the other tags do not occur and <code>sample-size</code> seems appropriate, but quite often the manner in which each of those questions is related to <em>sample size</em> seems fairly idiosyncratic.  </p>

<p><strong>I'm wondering how threads should best be organized with respect to these categories.</strong>  </p>

<hr>

<p>For what it's worth, my suggestions would be:  </p>

<ul>
<li>Copy the excerpt and tag wiki from <code>big-data</code> (which is somewhat more informative) to <code>large-data</code> (which seems to be the preferred tag), and make <code>big-data</code> a synonym.  </li>
<li>My preferred tag wiki excerpt for <code>sample-size</code> might read:  </li>
</ul>

<blockquote>
  <p>This tag is very ambiguous. Please use only if one of the following is
  not more appropriate: [small-sample], [large-data], [power-analysis],
  [power], or [underdetermined].</p>
</blockquote>

<p>However, this may not be the best approach, and I'd prefer to open this up to community discussion here than make changes on my own with the only oversight being conducted by two suggested edit reviewers.  </p>
