分类数据（category data） 在R语言中不需要特别将每一类别分为一列，这比Python要简单一些。
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ordinal category data 有序多分类 ; 所以也叫有序分类资料
Cited & Citing Category Data 被引和引用类目数据
data category 数据范畴 ; 数据分类 ; 资料类型 ; 资料类别
hybrid category data 混合类型数据
Category Aggregate Data 学科综合数据
data-based category 以数据为基础的分类
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In this method, you first obtain the category data that should be displayed and then create corresponding GUI content using the populate method.
在这个方法中，首先获得应该显示的类别数据，然后再使用populate方法相应创建GUI内容。
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The Canadian officials wanted Facebook to require consent for each category of data that an app sought.
WSJ: Selling You on Facebook
This data falls in to a category known as Big Data.
BBC: The boffins digging for nuggets of gold in big data
For each clinical category it releases data on mortality, complication rates, and patient satisfaction.
FORBES: What Business Can Learn From Cleveland Clinic: How To Report Quality To The Public
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