an class="r-pr">#&gt;</span>                                                        6.047e+00  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  poly(j, degree = poly_degree, raw = TRUE)2:as.factor(cal_time)2  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                       -1.825e-01  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  poly(j, degree = poly_degree, raw = TRUE)3:as.factor(cal_time)2  </span>
<span class="r-out