, raw = TRUE)1:as.factor(cal_time)8  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                        3.034e+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)8  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                                                       -4.528e-02  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  poly(j, degree = pol