SAS拆分数据集并将其导出到一个Excel文件中

Question

我正在尝试将数据集拆分为多个数据集，然后将它们导出到一个包含多个选项卡的Excel文件中。这是我试过的：

%let term1=2010;
%let new1=newa;
%let new2=newb;
%let dim_new=2;

%let school1=schoola;
%let school2=schoolb;
%let dim_school=2;

%macro split;
    %do n=1 %to &dim_new;
        %do m=1 %to &dim_school;
            data retention&term1._new&n._school&m;
                set retention&term1;
                if new_student="new&n" and acad_group="school&m" then output;
            run;
        %end;
    %end;
%mend;

%macro exportresult;
    %do n=1 %to &dim_new;
        %do m=1 %to &dim_school;
            libname datadir "B:\report";
            proc export data=retention&term1._new&n._school&m
            outfile="B:\report\retention&term1._new&n"
            dbms=xlsx replace;
            sheet="school&m";
            run;
        %end;
    %end;
%mend;

%split;
%exportresult;

我在每个数据集中都没有观察到。导出的Excel只有最后一所学校。我认为它可以有两个标签。

任何人都可以帮我解释原因吗？

谢谢！