如题，我想做dy为因变量，dl，dk，dt，为自变量，各变量差分后，做的变系数行业面板回归，想得到每个行业截面的系数，可是结果是下面这样，求解？
Dependent Variable: DY?   
Method: Pooled Least Squares   
Date: 06/15/15   Time: 21:34   
Sample (adjusted): 2005 2013   
Included observations: 117 after adjustments   
Cross-sections included: 1   
Total pool (balanced) observations: 117   
Cross sections without valid observations dropped   
   
Variable Coefficient Std. Error t-Statistic Prob.  
   
_A--DL_A 0.424070 0.084832 4.998947 0.0000
_A--DK_A 0.113661 0.066026 1.721454 0.0879
_A--DT_A -0.085425 0.075680 -1.128763 0.2614
   
R-squared 0.208332     Mean dependent var  -0.000804
Adjusted R-squared 0.194443     S.D. dependent var  0.349384
S.E. of regression 0.313582     Akaike info criterion  0.543796
Sum squared resid 11.21005     Schwarz criterion  0.614621
Log likelihood -28.81205     Hannan-Quinn criter.  0.572550
Durbin-Watson stat 2.710869