n class="va">inc</span>, <span class="va">type</span>, <span class="va">rl_sym</span>, <span class="va">u</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">box_cox_deriv</span><span class="op">(</span><span class="va">x</span>, lambda <span class="op">=</span> <span class="fl">1</span>, lambda_tol <span class="op">=</span> <span class="fl">1</span><span class="op">/</span><span class="fl">50</span>, poly_order <span class="op">=</span> <span class="fl">3</span><span class="op">)</s