adv63题的第57题，compress=yes问题

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请问这道题是选b还是d呢？谢谢解答

Which of the following is true about the COMPRESS=YES data set option?   

     A.It uses the Ross Data Compression method  

to compress numeric data.  

     B.It is most effective with character data  

that contains repeated characters.  

     C.It is most effective with numeric data that  

represents large numeric values.   

     D.It is most effective with character data that

contains patterns, rather than simple repetitions.

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关键词：compress Press comp COM ESS represents character effective following repeated

选 D 呀，简单重复的太少了，模式比较多

co_fund 发表于 2016-2-1 09:11
选 D 呀，简单重复的太少了，模式比较多

收到，谢谢啦

为什么参考答案是B

Pre_Guide_Advanced_for_SAS_9_第四版686 页：
Not all data files are good candidates for compression.However, compression can be
beneficial when the data file has one or more of the following properties:
• It is large.
• It contains many long character values.
• It contains many values that have repeated characters or binary zeros.
• It contains many missing values.
• It contains repeated values in variables that are physically stored next to one another.
显然 B最符合