[smile] 目前stata中还没有估计FE tobit的命令，存在技术上的困难，手册中的解释如下：
xttobit fits a random-effects tobit models. There is no command for a
conditional fixed-effects model, as there does not exist a sufficient
statistic allowing the fixed effects to be conditioned out of the
likelihood. Honore has developed a semiparametric estimator for
fixed-effect tobit models. Unconditional fixed-effects tobit models may
be fit with tobit command with indicator variables for the panels. The
appropriate indicator variables can be generated using tabulate or xi.
However, unconditional fixed-effects estimates are biased.
由于country effect与固定效应共线性，所以你的模型中无法加入country effect。时间效应的设定 B7_Panel_01FERE中有详细讲解。具体操作如下：
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