分析數據: set taq.cq_&yyyymmdd:;
by symbol date time NOTSORTED ex;
有成千上萬的我在天爲單位運行的代碼數據集。當& yyyymmdd只指定一個數據集(一天,例如20130102)時,它可以工作。然而,當我嘗試運行它爲多個數據集(例如,201301 :),SAS將返回以下錯誤: BY NOTSORTED/NOBYSORTED canno
我正在使用WRDS庫通過Spyder連接到WRDS數據庫。我輸入wrds。按照WRDS網站,查詢應該是這樣的: result = wrds.sql('select * from dataset', 'variable') (https://wrds-web.wharton.upenn.edu/wrds/support/Accessing%20and%20Manipulating%20the%20D
我嘗試使用下面的代碼與文件夾中的前綴列出所有的文件名,並調用一個函數命名CALCU與文件名: proc contents data=&libref.._all_ noprint out=contents; run;
data _null_;
set contents;
by memname;
if first.memname ;
if upcase
我連接MATLAB到沃頓研究數據服務數據庫Compustat和正在運行一個簡單的查詢 WRDS_Connect
setdbprefs('FetchInBatches','yes')
query = exec(WRDS, ['select gvkey from COMP.FUNDA where fyear = 2000 order by gvkey asc']);
result = fetc