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目的:为了使数据集便于分析,使其结构化
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洁净数据的定义:
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数据结构
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行列结构
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数据语义
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每个数据属于一个变量和一个观测
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给定一个数据集,很容易分辨什么是变量什么是观测,但是很难精确定义变量和观测
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There are three interrelated rules which make a dataset tidy:
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Each variable must have its own column.
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Each observation must have its own row.
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Each value must have its own cell.
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