嗨有谁知道如何计算每季度接下来四个季度的标准差?谢谢:)SAS前瞻性移动标准差
我尝试低于: 日期1是SAS在今年迄今为止,该季度
Proc sql ; create table th.totalroll as
Select distinct permco, date1 ,
(select std(adjret) from th.returns1 where qtr between
intnx('quarter',qtr(date),0) and intnx('quarter', qtr(date),+3)) as
TOTALroll From th.returns1 group by permco ,date1;
QUIT;
你有SAS/ETS许可?如果是的话,PROC EXPAND可以为你计算 – Longfish 2015-03-03 09:24:40