请教SAS BASE 123中的一道题目

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请教各位大神第111道题，
A SAS PRINT procedure output of the work. levels data set is listed below:
obs name level
1 Frank 1
2 Joan 2
3 Sui 2
4 Jose 3
5 Burt 4
6 Kelly .
7 Juan 1
The following SAS program is submitted:
data work.expertise;
set work.levels;
if level = . then
expertise ='Unknown';
if level = 1 then expertise ='low';
else if level = 2 or 3 then
expertise='Medium';
else
expertise='High';
run;
which of the follwing values does the variable EXPERTISE contain?
A Low,Medium, and High only
B Low,Medium, and Unknown only
c Low,Medium, High and Unknown only
D Low,Medium, High and Unknown and ' ' missing character value
答案选B，为什么啊，求助~~先谢谢了~~

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关键词：SAS base Base Procedure following Character only following procedure contain

else if level = 2 or 3 then

这句，level = 2是个判断句，3本身也是个判断句（非零）；故下面的else就废了。

需要改写成else if level = 2 or level = 3 then 。。。

另外楼主的程序有两个小地方没写对：experise =’Unknown‘;这个引号是中文的，并且experise写错了。

Tigflanker 发表于 2012-9-14 22:15
else if level = 2 or 3 then

这句，level = 2是个判断句，3本身也是个判断句（非零）；故下面的else就废 ...

太谢谢了，you are awesome！！

还有个小问题：
if level = 1 then expertise ='low';应改为
else iif level = 1 then expertise ='low';
否则if level = . then expertise ='Unknown';
不能正确使用