s"><i class="fa fa-check"></i><b>2.7</b> Loops</a></li>
<li class="chapter" data-level="2.8" data-path="r-intro.html"><a href="r-intro.html#user-defined-functions-udfs"><i class="fa fa-check"></i><b>2.8</b> User-Defined Functions (UDFs)</a></li>
<li class="chapter" data-level="2.9" data-path="r-intro.html"><a href="r-intro.html#graphics"><i class="fa fa-check"></i><b>2.9</b> Graphics</a></li>
<li class="chapter" data-level="2.10" data-path="r-intro.html"><a href="r-intro.html#review-questions"><i class="fa 