pan>                                                       -2.946e+04  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)16  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                        3.175e+04  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)17  </span>
<span class="r-out co"><span class="r-pr">