bobguy 发表于 2010-2-26 10:51 
ckkzys85 发表于 2010-2-26 10:51 
我选择的样本数是11个 ,在做tobit模型的时候,老是出现一个误差分布(error distribution)的模型结果,模型结果中有R 和校正R 及赤池信息准则等,总的来说结果也可以解释,但没有F值,我由于对计量原理的知识也不太懂,就想请问下,这是个错误的模型吗?如果是个正确的模型,请给我解释下error distribution模型及应用范围和说明了什么问题,万分感谢!
There are many suggested estimations for the Tobit model. But none of them has valid small sample properties. 11 data points are not enough to have any valid results.
I expand a little detail in estimations of tobit model.
1) ML--maximum likelihood
2) NLIN -- non linear regression
3) 2-step estimation
4) GMM -- generalized method of moments
5) SGMM -- simulated generalized method of moments