antics><mi>ùêê</mi><annotation encoding="application/x-tex">\mathbf{Q}</annotation></semantics></math>
are arbitrary, and <code><a href="../reference/QR.html">QR()</a></code> returns <code>QR(X)$Q</code> with
signs reversed, compared to <code>Z</code>.</p>
<div class="sourceCode" id="cb15"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="co"># same result as QR(X)$Q, but with signs reversed</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/utils/head.html"