rix.piecewise.msm</code>. This needs us to specify</p>
<ul>
<li><p>times when the <code>age</code> covariate changes (hence when the intensity changes) (<code>times</code>)</p></li>
<li><p>the values that <code>age</code> takes at these times (<code>covariates</code>)</p></li>
</ul>
<div class="sourceCode" id="cb104"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb104-1"><a href="timedep.html#cb104-1" aria-hidden="true" tabindex="-1"></a><span class="fu">pmatrix.piecewise.msm</span>(psor_ta