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                # 偏方差權衡 > 原文:[https://www.textbook.ds100.org/ch/15/bias_intro.html](https://www.textbook.ds100.org/ch/15/bias_intro.html) ``` # HIDDEN # Clear previously defined variables %reset -f # Set directory for data loading to work properly import os os.chdir(os.path.expanduser('~/notebooks/15')) ``` 有時,我們選擇的模型過于簡單,無法表示底層數據生成過程。其他時候,我們選擇的模型過于復雜,它與數據中的噪聲相匹配,而不是數據的整體模式。 為了理解發生這種情況的原因,我們使用概率和統計工具分析我們的模型。這些工具允許我們在描述建模中的基本現象的幾個孤立的例子之外進行歸納。特別是,我們將使用期望和方差工具來揭示偏差-方差權衡。
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