</span></span></span></span></span><span style="top:-3.6586em;"><span class="pstrut" style="height:3.0448em;"></span><span class="accent-body" style="left:-0.25em;"><span class="mord" style="">^</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.24575599999999997em;"><span></span></span></span></span></span></span></span></span></span></span>来平衡偏差和方差。这称为广义优势估计。<span ><span class="katex-display"><sp