[求助]SAS认证考试的一条题目

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data work.expertise;
input Obs name level;

if level = . then
expertise = 'Unknown';
else if level = 1 then
expertise = 'Low';
else if level = 2 or 3 then
expertise = 'Medium';
else
expertise = 'High';
cards;
1 Frank 1
2 Joan 2
3 Sui 2
4 Jose 3
5 Burt 4
6 Kelly .
7 Juan 1
;
run;

为什么记录“5 Burt 4”得出来的expertise='Medium',不是应该为'High'吗？

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关键词：sas认证 认证考试 UNKNOWN Expert Medium 考试 题目 SAS 认证

the problems lies on 'else if level = 2 or 3 then expertise = 'Medium'; '
'if level=2 or 3 ' should be explained as 'if level=2 or if 3' which equals to 'if level=2 or if true' which means this condition is always be true. So any value of 'level' other than '.' and '1' will fall into this category. Remember, like other programming lauguage, SAS will interepret a number ge 1 as 'true'.

The original intention of this code should use the following code ' else if level = 2 or if level = 3 then experience= 'Medium‘’

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