跟crakman做sas base认证试题（46）

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From crackman's blog on Baidu


               
                <p><font size="4">46.Given the SAS data set WORK.ONE: <br>
<br>
  Obs&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  Revenue2008&nbsp;&nbsp;  Revenue2009&nbsp;&nbsp;  Revenue2010<br>
  ---&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  -----------&nbsp;&nbsp;  -----------&nbsp;&nbsp;  -----------<br>
  1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  1.2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  1.6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  2.0<br>
<br>
The following SAS program is submitted: <br>
<br>
  data WORK.TWO;<br>
&nbsp;&nbsp;&nbsp;&nbsp;  set WORK.ONE; <br>
&nbsp;&nbsp;&nbsp;&nbsp;  Total=mean(of Rev:);<br>
  run;<br>
<br>
What value will SAS assign to Total?</font></p>
<p><font size="4">&nbsp;&nbsp;&nbsp;&nbsp;  A. 3 <br>
&nbsp;&nbsp;&nbsp;&nbsp;  B. 1.6<br>
&nbsp;&nbsp;&nbsp;&nbsp;  C. 4.8<br>
&nbsp;&nbsp;&nbsp;&nbsp;  D. The program fails to execute due to errors. <br>
<br>
Answer: B</font></p>
<p><font size="4">本题考察的是变量简写的问题。<br>
TOTAL=MEAN(OF REV:) 等价于 TOTAL=MEAN(OF REVENUE2009-REVENUE2010) 或者TOTAL=MEAN(REVENUE2008，REVENUE2009，</font></p>
<p><font size="4">REVENUE2010).<br>
REV:表示是以REV开头的所有变量。<br>
可以考虑一下，如果是REV结尾的所有变量，该如何操</font></p> <a href="http://hi.baidu.com/crack%5Fman/blog/item/10de695d16b18c3a2934f0c1.html">阅读全文</a>
               
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