proc sql;
select average(p) as b from a
group by a,k;
quit;

没懂意思。

是的是的，忘了强大的sql了，
proc sql;
create table shuju as
select a,k,avg(p) as b from mydata
group by a,k;
quit;

那比如segment变量下分很多类，怎么对这些分类分别求均值