proc sql;
create table temp as
select family,sum(mb) as sum_mb,count(*) as N
from dataset
group by family;
quit;
然后join你的dataset和temp:
proc sql;
create table new_dataset as
select *
from dataset as a left join temp as b
on a.family=b.family;
quit;
接着做条件判断:
data new_dataset;
set new_dataset;
if sum_mb>=1 then mbfamily=1;
else mbfamily=0;
run;


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