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异常值检测 | ||
# 异常值检测 | ||
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1,极值分析 | ||
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1,极值分析 | ||
通过scatterplots,histogramas, box和whisker plot分析极值。 | ||
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通过scatterplots,histogramas, box和whisker plot分析极值。 | ||
查看样本分布(假设高斯分布),去距离1/4和3/4值2-3倍标准差数值的样本。 | ||
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查看样本分布(假设高斯分布),去距离1/4和3/4值2-3倍标准差数值的样本。 | ||
2,临近方法 | ||
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2,临近方法 | ||
基于k-means分析样本质心,去掉离质心特别远的样本。 | ||
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基于k-means分析样本质心,去掉离质心特别远的样本。 | ||
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3,投影方法 | ||
3,投影方法 | ||
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通过PCA,SOM,sammon mapping去掉不重要特征。 | ||
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