#&gt;</span>                                                        2.972e+04  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)18  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                        4.811e+04  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)19  </span>
<span class="r-out co"><span class