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量化数字的相似性即「集中趋势量数」(measures of central tendency),包括平均数、中位数和众数;
量化数字的差异即「差异量数」(measures of variability),包括方差和标准差。
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本文将对标准差这一概念提供直观的视觉解释。
量化数字的相似性即「集中趋势量数」(measures of central tendency),包括平均数、中位数和众数;
量化数字的差异即「差异量数」(measures of variability),包括方差和标准差。
线性模型中特征的系数,或深度网络中的边。训练线性模型的目标是确定每个特征的理想权重。如果权重为 0,则相应的特征对模型来说没有任何贡献。