                                    3.493e+03  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)10  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                       -2.023e+04  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                            as.factor(cal_time)11  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>            