ta-level="12.3.4" data-path="rcat.html"><a href="rcat.html#lubridate"><i class="fa fa-check"></i><b>12.3.4</b> lubridate</a></li>
</ul></li>
<li class="chapter" data-level="12.4" data-path="rcat.html"><a href="rcat.html#mixed-effects-modeling"><i class="fa fa-check"></i><b>12.4</b> Mixed-effects Modeling</a><ul>
<li class="chapter" data-level="12.4.1" data-path="rcat.html"><a href="rcat.html#nlme"><i class="fa fa-check"></i><b>12.4.1</b> nlme</a></li>
<li class="chapter" data-level="12.4.2" data-path="rcat.