<p><a href="http://area51.stackexchange.com/">Area 51</a> is the Stack Exchange site for proposing new Stack Exchange sites. If your idea for a new site comes from observing commonalities among off-topic questions on Cross Validated, it'd be sensible to discuss it first here on CV's Meta &amp; to link to your proposal if you decide to make one.</p>

<p>Your example&mdash;questions involving R&mdash;has been much discussed. As @AndreSilva points out, there was a proposal for an R Stack Exchange site, but it didn't go anywhere. Currently we welcome questions that arise from using R, or other statistical software, on Cross Validated when they're <em>statistical</em> questions. (Understand "statistical" here in a broad sense&mdash;encompassing machine learning, data visualization, &amp;c.) The majority that aren't are programming questions, &amp; have a home on Stack Overflow, as @NormalHuman points out. A minority are better suited to other Stack Exchange sites (see e.g. <a href="https://askubuntu.com/questions/tagged/r">https://askubuntu.com/questions/tagged/r</a>). Some fall into a grey area where it's not clear, perhaps not even to the person who asked it; many of us try to encourage &amp; facilitate the asking &amp; answering of questions in a software-agnostic fashion. We also maintain a collection of links: <a href="https://stats.meta.stackexchange.com/questions/793/internet-support-for-statistics-software">Internet Support for Statistics Software</a>.</p>
