evttime <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/ifelse.html" class="external-link">ifelse</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/NA.html" class="external-link">is.na</a></span><span class="op">(</span><span class="va">pfs.time</span><span class="op">)</span>,<span class="va">evttime</span>,<span class="va">pfs.time</span><span class="op">)</span>,</span>
<span>                                                          Event <span