<p>Currently, the tag <a href="https://stats.stackexchange.com/questions/tagged/error" class="post-tag" title="show questions tagged &#39;error&#39;" rel="tag">error</a> has been used mainly for two purposes on CV:</p>

<ol>
<li>Statistical measure of deviation;</li>
<li>Notification messages shown when statistics-related software fails.</li>
</ol>

<p>We have a <a href="https://stats.stackexchange.com/questions/tagged/residuals" class="post-tag" title="show questions tagged &#39;residuals&#39;" rel="tag">residuals</a> tag. According to <a href="http://en.wikipedia.org/wiki/Errors_and_residuals_in_statistics" rel="nofollow noreferrer">Wikipedia</a>: <em>error</em> (observed - true function value) and <em>residual</em> (observed - estimated function value) are related but not same.  </p>

<p>We have the tag <a href="https://stats.stackexchange.com/questions/tagged/deviation" class="post-tag" title="show questions tagged &#39;deviation&#39;" rel="tag">deviation</a>, but it is a synonym to <a href="https://stats.stackexchange.com/questions/tagged/standard-deviation" class="post-tag" title="show questions tagged &#39;standard-deviation&#39;" rel="tag">standard-deviation</a>.  We also have <a href="https://stats.stackexchange.com/questions/tagged/bias" class="post-tag" title="show questions tagged &#39;bias&#39;" rel="tag">bias</a>.</p>

<p>Is it worth it to fix this? If yes, how? 
Please, present a proposal considering two actions:</p>

<ol>
<li>looking forward (i.e. to stop <a href="https://stats.stackexchange.com/questions/tagged/error" class="post-tag" title="show questions tagged &#39;error&#39;" rel="tag">error</a> tag being used for different purposes from now and on);  </li>
<li>to fix this looking backwards (i.e., retag in a proper manner existing <a href="https://stats.stackexchange.com/questions/tagged/error" class="post-tag" title="show questions tagged &#39;error&#39;" rel="tag">error</a> questions).</li>
</ol>

<p>Edit 1.</p>

<p>Looking forward the action which will result from this question, it was mapped (05th, July, 2013) among the 125 <a href="https://stats.stackexchange.com/questions/tagged/error" class="post-tag" title="show questions tagged &#39;error&#39;" rel="tag">error</a> questions, 8 relating to software error messages.<br>
They are (from newest to oldest):</p>

<p><a href="https://stats.stackexchange.com/questions/58190/error-message-of-ugarchfit">1</a>, <a href="https://stats.stackexchange.com/questions/54686/dudi-pca-error-in-vrow-w-non-numeric-argument-to-binary-operator">2</a>, <a href="https://stats.stackexchange.com/questions/53385/jags-error-when-fitting-logistic-additive-mixed-model">3</a>, <a href="https://stats.stackexchange.com/questions/41786/compilation-error-in-jags">4</a>, <a href="https://stats.stackexchange.com/questions/33056/how-do-i-get-the-sse-for-predictions-using-sas">5</a>, <a href="https://stats.stackexchange.com/questions/26045/array-index-is-less-than-one-winbugs-error">6</a>, <a href="https://stats.stackexchange.com/questions/24270/roc-curve-error">7</a> and <a href="https://stats.stackexchange.com/questions/2085/checking-assumptions-for-random-effects-in-nested-mixed-effects-models-in-r-s">8</a>.  </p>

<p>Status-completed (Edit 2).</p>

<ol>
<li><p>As far as I could go, I asked to CV's moderators to create the <a href="https://stats.stackexchange.com/questions/tagged/error-message" class="post-tag" title="show questions tagged &#39;error-message&#39;" rel="tag">error-message</a> tag as suggested by @A.M. (and with no objection by @gung). @chl gently, helped me in this step;</p></li>
<li><p>As suggested by @gung in #1 item, the tag wiki excerpts were edited (with peer review) for <a href="https://stats.stackexchange.com/questions/tagged/error" class="post-tag" title="show questions tagged &#39;error&#39;" rel="tag">error</a> and <a href="https://stats.stackexchange.com/questions/tagged/error-message" class="post-tag" title="show questions tagged &#39;error-message&#39;" rel="tag">error-message</a> to avoid confusion in future questions;</p></li>
<li><p>From the eight questions above, five of them had the tag <a href="https://stats.stackexchange.com/questions/tagged/error" class="post-tag" title="show questions tagged &#39;error&#39;" rel="tag">error</a> replaced by <a href="https://stats.stackexchange.com/questions/tagged/error-message" class="post-tag" title="show questions tagged &#39;error-message&#39;" rel="tag">error-message</a> as suggested in both answers (but not at once, as suggested on @gung's answer, item #3). Two of them (2 and 7) crashed in the meantime, and one I overlooked about the tag usage (5). </p></li>
</ol>
