Estimation of Fuel Coefficients of Cement Production: A Fixed-Effects Approach to Nonlinear Regression
估计水泥生产中不同工艺的燃料系数，考虑工厂多窑结构，发现工厂间未观测异质性显著，并使用非线性回归的固定效应估计器获得结果。
Fuel coefficients of cement production—one for each process of production—are estimated by explicitly accounting for the multiple-kiln structure of cement plants. Unobserved heterogeneity across plants is found to be significant. Furthermore, since the estimable model is nonlinear in exogenous variables and parameters, a fixed-effects estimator for nonlinear regression is used to obtain the estimates.