对CD生产函数进行回归lnk的系数为负，LNY = -0.4984689026*LNL + 0.6581700214*LNK + 4.212668685
请问这样是符合经济实际的吗？我觉得应该为正吧。。谢谢各位的指点哈。。

具体的估计结果为：

Dependent Variable: LNY    
Method: Least Squares    
Date: 04/24/09   Time: 10:39    
Sample: 1992 2008    
Included observations: 17    
    
Variable Coefficient Std. Error t-Statistic Prob. 
    
LNL -0.498469 0.604772 -0.824226 0.4236
LNK 0.658170 0.042185 15.60214 0.0000
C 4.212669 0.700652 6.012501 0.0000
    
R-squared 0.999327     Mean dependent var  10.98587
Adjusted R-squared 0.999231     S.D. dependent var  0.465043
S.E. of regression 0.012898     Akaike info criterion  -5.704630
Sum squared resid 0.002329     Schwarz criterion  -5.557592
Log likelihood 51.48935     F-statistic  10392.17
Durbin-Watson stat 0.480959     Prob(F-statistic)  0.000000