2.1Tidy Data

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  • 目的:为了使数据集便于分析,使其结构化

  • 洁净数据的定义:

  • 数据结构

  • 行列结构

  • 数据语义

  • 每个数据属于一个变量和一个观测

  • 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

  • There are three interrelated rules which make a dataset tidy:

  • Each variable must have its own column.

  • Each observation must have its own row.

  • Each value must have its own cell.

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