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1. data nonresp(where=(ranuni(5555)<.1));
   
2. set acqmod.both(where=(respond^=1));
   
3. run;
   
4. data acqmod.model;
   
5. set acqmod.both(where=(respond=1)) nonresps;
   
6. if respond = 1 then smp_wgt = 1;
   
7. else smp_wgt = 10;
   
8. respond = (respond = 1);
   
9. run;
   
10. proc freq;
    
11. weight smp_wgt;
    
12. table respond activate /missing;
    
13. run;

复制代码

以上为什么在读完数据之后来一个“respond=(respond=1);"?这是赋值语句吗？这是要
让所有的respond都等于1吗？
后面那个weight,实在是不知道用力干什么的，察看了帮助还是很疑惑。有没有达人可
以告诉一下加了这个weight statement和不加有什么区别？

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关键词：简单问题 ranuni Where Data HERE where

1# chichi_shu

respond = (respond = 1);

*That makes variable respond binary, i.e., either 1 when (old) respond =1 or 0 otherwise.

weight smp_wgt;

Considering you use a WEIGHT statement of 'smp_wgt', PROC FREQ assumes that an observation represents smp_wgt observations , where smp_wgt is a number of either 1 or 10 here.  
If you do not specify a WEIGHT statement, each observation has a default weight of 1. The sum of the WEIGHT variable values represents the total number of observations.
For further illustrating this question, an example was following by:

obs reponse smp_wgt
1    1             10
2    0              1

in this case,
if specifying weight of smp_wgt, then total # of observations =1*10 +1*1 =11, % of (respond =1) =10/11;
if not specifying weight, then total # of observations =1*1 +1*1 =2, % of (respond =1) =1/2

楼上老大太nice了！
谢谢！