sas base 123题中的第91 题

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sas base 123题中的第91 题
The following SAS program is submitted:
proc report data = work.houses nowd;
column style price;
where prices <100000;
<insert DEFINE statements here>
title;
run;
Exhibit: the output from the REPORT procedure.

Assume permanent variable labels have been assigned.
Which one of the following completes the program and produces the output
displayed in the exhibit?
A. define style / display width = 9;
define price / sum format = comma9. width = 10;
B. define style / width = 9;
define price / sum format = comma9. width = 10;
C. define style / group width = 9;
define price / sum format = comma9. width = 10;
D. define style / order width = 9;
define price / sum format = comma9. width = 10;

answer:D     why?

A后用display 为什么不可以?  sum group display across 的用法

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关键词：SAS base Base proc report following Program statements following permanent procedure produces

A: "DISPLAY"选项会把'style'的每条记录都列出来；
B：DEFINE后无选项，按默认"DISPLAY"处理；
C: "GROUP"和"SUM"联合使用的话，每个"GROUP"只显示一条汇总结果；
D: "ORDER"与"DISPLAY"的区别是同一个组别'style'只显示一次。

extension 发表于 2016-1-14 17:37
A: "DISPLAY"选项会把'style'的每条记录都列出来；
B：DEFINE后无选项，按默认"DISPLAY"处理；
C: "GROUP ...

最近在学，受教了

“group” creates one row for each unique value of the variable,
while “order” creates one row for each observation with rows arranged according to the values of the order variable.
So the option is “order” here.

extension 发表于 2016-1-14 17:37
A: "DISPLAY"选项会把'style'的每条记录都列出来；
B：DEFINE后无选项，按默认"DISPLAY"处理；
C: "GROUP ...

简单明了，感谢感谢！