/rdrr.io/r/stats/contrasts.html" class="external-link">contrasts</a></span><span class="op">(</span><span class="va">idata</span><span class="op">$</span><span class="va">position</span><span class="op">)</span><span class="op">&lt;-</span> <span class="va">C</span></span></span>
<span class="r-in"><span><span class="op">(</span><span class="va">pmod1.aov</span> <span class="op">&lt;-</span> <span class="fu">car</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/pkg/car/man/Anova.html