[程式] SAS industry & year fixed effect
[軟體程式類別]:
SAS
[程式問題]:
迴歸
[軟體熟悉度]:
新手
小弟需要在回歸中同時固定Industry fixed effect跟year fixed effect
嘗試寫了以下的回歸式:
proc sort data=reg_bhar out=reg_bhar
by year sic_code;
run;;
proc panel data=reg_bhar;
id year sic_code;
model bhar=relative_size cash diversity;
run;
結果卻出現了以下的錯誤警告
Error: the data set work.reg_bhar is not sorted in ascending sequence
with respect to the time series ID. The current time period has Sic_code=3613
and the previous time period has sic_code=3613 insection year=2010;
可是只排序Year的話一樣會出現問題
希望能請教該怎麼解決，是我使用錯誤的模型還是該在如何處理一下母資料，非常感謝!
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