用两阶段度量误差模型方法和ForStat软件进行模型整合

Model Integration Using the Method of Two-stage Error-in-variable and the Soft of ForStat

以同龄林分的年龄X、平均单株胸径Y1 (cm)和平均单株材积Y2 (m3)的关系模型为例 ,应用ForStat软件 ,分别用常规方法和两阶段度量误差模型方法对模型进行整合。结果表明 ,应用常规方法得到的Y2 估计值明显有偏 ,而应用度量误差模型方法得到的Y2 估计值明显优于应用常规方法得到的估计结果。事实证明

In this study, The models of stand age, stand mean diameter at breast height and stand volume are integrated by using the method of two_stage error_in_variable and the ordinary method separately with the soft of ForStat. The result indicates that the estimation of stand volume obtained by ordinary method has bias while the estimation of two_stage error_in_variable is obviously more accurate and has no bias. It is proved that the method of the two_stage error_in_variable and the soft of ForStat are useful method of integrating models.