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Re: st: Tobit Model and time series operator


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Tobit Model and time series operator
Date   Fri, 21 Oct 2011 07:55:54 +0100

This message often arises from a typo in which you put a stop or
period . in a place where it makes no sense. By implication, and
contrary to advice, you are not specifying what you typed exactly, but
that is a common reason for this error message. In addition, it
appears that you are not deliberately using any time series operators,
so that remains a guess that may apply to you.

Nick

On Fri, Oct 21, 2011 at 3:42 AM, House Wang <jwanghouse@gmail.com> wrote:

> I run a tobit model like this: tobit y1 x1 x2 x3 i.year, ll(0) ul(1).
> The i.year variable is to construct year as a categorical variable
> because year is just a regular variable, not a time variable in
> longitudinal sense.
> But the results show that
> time-series operators not allowed
> r(101);
>
> Does this suggest tobit model cannot take time-series operators or
> anything else?
> Should I use other formats of operators?
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