跟crakman做sas base认证试题（20）

shiyiming · 发表于 2010-11-11 11:11:03

From crackman's blog on Baidu

20. The data set WORK.REALESTATE has the variable LocalFee with a format of 9. and a variable CountryFee with a format of 7.; 
 
The following SAS program is submitted: 
 
 data WORK.FEE_STRUCTURE; 
     format LocalFee CountryFee percent7.2; 
     set WORK.REALESTAT; 
     LocalFee=LocalFee/100; 
     CountryFee=CountryFee/100; 
 run; 
 
What are the formats of the variables LOCALFEE and COUNTRYFEE in the output dataset? 
     A. LocalFee has format of 9. and CountryFee has a format of 7. 
     B. LocalFee has format of 9. and CountryFee has a format of percent7.2 
     C. Both LocalFee and CountryFee have a format of percent7.2 
     D. The data step fails execution; there is no format for LocalFee. 
 
Answer: C 
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其他本博客文章均作此声明！
FORMAT语句在DATA步中，将会改变数据集中的变量格式。但是PROC FORMAT语句中定义的格式仅仅是在PROC步中有作用。另外FORMAT语句在SET前后无差别。FORMAT语句为 
非执行语句。 
为了更好的理解我写一个模拟程序，如下：
data crackman; 
format x y f8.; 
input x y@; 
cards; 
1 2 
3 4 
7 8 
8 9 
; 
run; 
data result; 
format x y percent7.2; 
set crackman; 
x=x/100; 
y=y/100; 
run; 
proc print data=result; 
run; <a href="http://hi.baidu.com/crack%5Fman/blog/item/6e8330164d8ef541f919b8fb.html">阅读全文</a>

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