<p>There have been several discussions on meta about how to organize frequently asked questions, and one idea is that one can simply write and answer such a question, creating a thread that can later be used to close duplicates:</p>

<blockquote>
  <p>Good approximations to FAQs are possible by someone just writing a good question and then answering it really well. (@NickCox in <a href="https://stats.meta.stackexchange.com/questions/2336">Does it make a sense to create the reference questions for popular topics?</a>)</p>
  
  <p>When I have time in a couple of weeks I'll start a controversial one to see how the process works, e.g. FAQ: How do you interpret a large P-value? (@FrankHarrell in <a href="https://stats.meta.stackexchange.com/questions/2004">Common Issues and FAQs</a>)</p>
</blockquote>

<p>I think nobody attempted it so far. While reviewing PCA questions, I noticed that technical questions about the relationship between SVD and PCA are asked every now and then (example: <a href="https://stats.stackexchange.com/questions/122879/">Why are the singular values of a standardized data matrix not equal to the eigenvalues of its correlation matrix?</a>; more examples: <a href="https://stats.stackexchange.com/questions/72224">two</a>, <a href="https://stats.stackexchange.com/questions/96482">three</a>, <a href="https://stats.stackexchange.com/questions/64636">four</a>, etc.), but there is no one thread that is good enough to be "canonical". The only pretty good thread <a href="https://math.stackexchange.com/questions/3869">is on math.SE</a> and we cannot use it for closing duplicates here.</p>

<p>So I decided to try it out, by writing and answering a question myself: </p>

<ul>
<li><p><a href="https://stats.stackexchange.com/questions/134282">Relationship between SVD and PCA. How to use SVD to perform PCA?</a></p>

<p><strike>FAQ: Relationship between SVD and PCA, or how to use SVD to perform PCA?</strike> (original title)</p></li>
</ul>

<p>Do you think it makes sense? Or is it a waste of time?</p>
