                                                    1.089e+04  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)14  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                       -1.504e+04  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)15  </span>
<span class="r-out co"><span class="r-pr">#&gt;</s