ociation between the versions of the longitudinal
outcomes and the hazard of the event are time-constant (i.e., the
proportional hazards assumption). We can relax this assumption by
specifying time-varying coefficients via the
<code>functional_forms</code> argument of function
<code><a href="../reference/jm.html">jm()</a></code>.</p>
<p>We will illustrate this capability using the PBC dataset. We start by
fitting a Cox model for the composite event transplantation or death,
including sex as a baseline covar