The second moment of the least squares estimator in the nonlinear regression model is obtained in this paper in terms of two kinds of curvatures defined by Bates and watts.

• 本文从似然方程的二级近似出发,求出了非线性回归模型最小二乘估计量(LSE)的二阶矩与Bates and Watts定义的二种曲率之间的关系。