A NOTE ON THE ESTIMATION OF COBB‐DOUGLAS PRODUCTION FUNCTIONS WHEN SOME EXPLANATORY VARIABLES HAVE ZERO VALUES
针对农业经济研究中投入变量常出现零值的情况，提出使用虚拟变量来无偏估计柯布-道格拉斯生产函数的参数。
Cases of zero‐values of some input variables in production studies often arise in agricultural economics. By using a dummy variable, associated with the incidence of the zero observations, the appropriate parameters of Cobb‐Douglas production functions can be estimated in an unbiased way.