下面的程序，是我用来生成行业虚拟变量的。但是为啥，为啥生成的变量中取值是1和.(missing )，而不是0.请各位大侠帮忙查下哪里有问题。拜托啦~~
data a;input n r sic value date ddmmyy8.;
format date ddmmyy10.;
cards;
1  0.1  1   109 01-12-10
2  0.2  1   209 01-12-10
3  0.3  1   167 01-12-10
4  0.1  2   123 01-12-10
5  0.2  2   200 01-12-10
6  0.3  2   210 01-12-10
7  0.4  2   342 02-12-10
8  0.12 1   223 02-12-10
1  0.29 1   560 02-12-10
;
run;
proc sql noprint;
select distinct sic into: values separated by ' '
from a
where not missing(sic);
%let n=&sqlobs.;
quit;

%macro create_dumy;
data b;
set a;
select(sic);
%do i=1 %to &n.;
%let val = %scan(&values.,&i);
when( "&val.") dumy_&i =1;
%end;
otherwise put '0';
end;
run;

%mend;

%create_dumy