请教，关于QSCAN-经管之家官网！

其中%str（）其实是指一个表达式“空格”

但是我感觉自己还是不太理解。谢谢大家。

1. %let winsvars = N_inst_buy_diff vol_inst_buy_diff amount_inst_buy_diff
   
2. N_pert_inst_buy_diff vol_pert_inst_buy_diff amount_pert_inst_buy_diff
   
3. N_ind_buy_diff vol_ind_buy_diff amount_ind_buy_diff
   
4. N_pert_ind_buy_diff vol_pert_ind_buy_diff amount_pert_ind_buy_diff
   
5. N_inst_sell_diff vol_inst_sell_diff amount_inst_sell_diff
   
6. N_pert_inst_sell_diff vol_pert_inst_sell_diff amount_pert_inst_sell_diff
   
7. N_ind_sell_diff vol_ind_sell_diff amount_ind_sell_diff
   
8. N_pert_ind_sell_diff vol_pert_ind_sell_diff amount_pert_ind_sell_diff
   
9. N_inst_net_event vol_inst_net_event amount_inst_net_event
   
10. N_pert_inst_net_event vol_pert_inst_net_event amount_pert_inst_net_event
    
11. N_ind_net_event vol_ind_net_event amount_ind_net_event
    
12. N_pert_ind_net_event vol_pert_ind_net_event amount_pert_ind_net_event
    
13. N_inst_net_benchmark vol_inst_net_benchmark amount_inst_net_benchmark
    
14. N_pert_inst_net_benchmark vol_pert_inst_net_benchmark amount_pert_inst_net_benchmark
    
15. N_ind_net_benchmark vol_ind_net_benchmark amount_ind_net_benchmark
    
16. N_pert_ind_net_benchmark vol_pert_ind_net_benchmark amount_pert_ind_net_benchmark
    
17. N_inst_net_diff vol_inst_net_diff amount_inst_net_diff
    
18. N_pert_inst_net_diff vol_pert_inst_net_diff amount_pert_inst_net_diff
    
19. N_ind_net_diff vol_ind_net_diff amount_ind_net_diff
    
20. N_pert_ind_net_diff vol_pert_ind_net_diff amount_pert_ind_net_diff;
    
21. %macro winsorize;
    
22. %do i=1 %to 60;
    
23. %let rvars=%trim(%QSCAN(&winsvars,&i,%STR()));
    
24. %let pct_u = 99;
    
25. %let pct_l = 1;
    
26. proc sort data = dtrades_test;
    
27. by &rvars;
    
28. run;
    
29. proc univariate data = dtrades_test noprint;
    
30. var &rvars;
    
31. output out = temp
    
32. p&pct_l = t_p&pct_l
    
33. p&pct_u = t_p&pct_u;
    
34. run;
    
35. data dtrades_test;
    
36. set dtrades_test;
    
37. temp = 1;
    
38. run;
    
39. data temp;
    
40. set temp;
    
41. temp = 1;
    
42. run;
    
43. data dtrades_test;
    
44. merge dtrades_test temp;
    
45. by temp;
    
46. run;
    
47. data dtrades_test;
    
48. set dtrades_test;
    
49. if &rvars = . then &rvars = .;
    
50. else
    
51. if &rvars <= t_p&pct_l then &rvars = t_p&pct_l;
    
52. if &rvars >= t_p&pct_u then &rvars = t_p&pct_u;
    
53. run;
    
54. data dtrades_test;
    
55. set dtrades_test;
    
56. drop t_p&pct_l t_p&pct_u;
    
57. run;
    
58. %end;
    
59. %mend winsorize;
    
60. %winsorize;

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