-level="2.4" data-path="r-intro.html"><a href="r-intro.html#factors"><i class="fa fa-check"></i><b>2.4</b> Factors</a></li>
<li class="chapter" data-level="2.5" data-path="r-intro.html"><a href="r-intro.html#data-frames"><i class="fa fa-check"></i><b>2.5</b> Data Frames</a></li>
<li class="chapter" data-level="2.6" data-path="r-intro.html"><a href="r-intro.html#lists"><i class="fa fa-check"></i><b>2.6</b> Lists</a></li>
<li class="chapter" data-level="2.7" data-path="r-intro.html"><a href="r-intro.html#loop