根据 Ajmani 教科书和 SAS 代码书,这是我在使用 fixone 选项时应该看到的:
这就是我所看到的:
如何获得横截面效果行?这是我正在运行的代码:
libname mydata "/courses/u_northwestern.edu1/i_1055211/c_6538"
access=readonly;
/* Create temporary data sets to mess with */
Data week4;
set mydata.airlines_week_4;
Ln_C=log(C);
Ln_Q=Log(Q);
Ln_PF=Log(PF);
label
C='Total cost ($K)'
I='Firm Number (CSID)'
LF='Load Factor (utilization index)'
Ln_C='Log transformation of costs'
Ln_PF='Log transformation of fuel price'
Ln_Q='Log transformation of quantity'
PF='Fuel price'
Q='Output in revenue passenger miles (index)'
T='Time period (TSID)';
run;
/* This is the program given on the top of page 118 and produces Output 7.4 */
proc panel data=week4;
id i t;
Output_7: model Ln_C=Ln_Q Ln_PF LF/fixone;
title 'OUTPUT 7.4. LSDV estimates for the airlines data using Proc panel.';
run;
横截面行在哪里?我没有在任何应该具有它们的输出中看到任何横截面效果行。