嗨有誰知道如何計算每季度接下來四個季度的標準差?謝謝:)SAS前瞻性移動標準差
我嘗試低於: 日期1是SAS在今年迄今爲止,該季度
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許可?如果是的話,PROC EXPAND可以爲你計算 – Longfish 2015-03-03 09:24:40