proc sort data=raw.aa;
  by stockcode descending date;
run;

data aax;
  set raw.aa;
        by stockcode descending date;
        retain xs;
        if first.stockcode then xs=input(tafactor,best.);
        if ^missing(close) & ^missing(tafactor) then
        nclose=put(round(input(close,best.)*input(tafactor,best.)/xs,0.01),7.2-l);
run;

这里后转换因子数据是tafactor吧？

close*Fatactor/xs  里 fatactor应该是tafactor么？

是的，写错了
非常感谢！