ion \(n\) by \(n\) and \(Z\) is an \(n\) by \(p\)
matrix with orthonormal rows.</p>
    </div>
    <div id="author">
    <h2>Author</h2>
    <p>David Gerard.</p>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="va">X</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/matrix.html" class="external-link">matrix</a></span><span class="op">(</span><span class="fl">1</s