大家好！我是stata初学者，现在做tobit回归遇到两个问题，求帮助？
程序：. tobit f.overinv inspect soe soe_inspect orecw compw mspw mfee i.ind1,ll(0) vce(r)
运行结果是这样的：
time variable not set
r(111);
有两个问题：（1）因变量 f.overinv是什么意思？有相应详细的介绍吗？
（2）time variable not set该怎么办？
另外有一组数据和这里的数据格式类似，那组数据执行出来了，偏偏这里做不出来，好长时间了，急求！
f. denotes the future time series operator, which means using Overinvestment of next time period (t-1).
You could type "help time series operator" for more details.
It requires that dataset in the memory is organized in terms of time series to use future operator, so you must use tsset or xtset to organize your dataset. For more details, help tsset or help xtset.
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