为什么选B，不应该是A吗？
对style进行了排序了吧？需要order吧？group只是分组，对吗？

与此类似的还有99题，感觉B和C都可以，order就是在group的基础上加了排序，是这样吗？
Exhibit: view two reports. Assume permanent variable labels have been assigned.


The following SAS program is submitted and produces the first report: proc report data = sasuser.shoes nowd;

column region subsidiary sales;

define subsidiary / display;

define region / group;

define sales / sum;

run;

Which one of the following corrects the program above to produce the second report shown in the exhibit?

A. Define the variable SUBSIDIARY with a SUM usage.

B. Define the variable SUBSIDIARY with a GROUP usage.

C. Define the variable SUBSIDIARY with an ORDER usage.

D. Define the variable SUBSIDIARY with an ACROSS usage.

没有排序，否则比如ranch 为什么有好多个分开的？ 所以不是order

group分组后算出这一组的statistics

只有group后才能计算mean

ranch没有很多个分开的吧？结果是
CONDO $79,700
RANCH $68,575
SPLIT $77,983
TWOSTORY $62,550
原始数据中有多个分开的，用group是分组，用order是排序，然后price是analysis数据，order和group都可以起到分组的作用，order多了一个排序，如果按原始数据group，结果就R,S,C,T吧？