            3.535e+02  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                             as.factor(cal_time)4  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                       -3.104e+02  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                             as.factor(cal_time)5  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                    