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      <nav aria-label="Table of contents"><h2>Table of contents</h2>
        <ul class="book-toc list-unstyled">
<li><a class="" href="index.html">Overview</a></li>
<li><a class="active" href="foreword.html">Foreword</a></li>
<li><a class="" href="programming-basics.html"><span class="header-section-number">1</span> Programming basics</a></li>
<li><a class="" href="intro-to-r.html"><span class="header-section-number">2</span> Intro to R</a></li>
<li><a class="" href="starting-wit