Thanks for supplying the reference.
In this case I doubt that we would be looking at anything much in the
way of Stata code without the middle author, Brian Poi.
We know that the Poisson can produce zeros, but setting Poi equal to
blank "" is a step too far,
Nick
On Wed, Mar 20, 2013 at 3:34 PM, natasha agarwal
<agarwana2@googlemail.com> wrote:
> Please accept my apologies for the previous post.
>
> I was attempting to calculate the TFP for a sample of firms for the
> period 2001 to 2005 using the levpet command, and wanted to know if
> one can use time dummies in the free variable list ?
>
> Please note that levpet is a user written programme available as a
> stata module by levinsohn and petrin in their co-authored paper in
> 2003. Stata Journal article of the
> same can be accessed at
> http://www.stata-journal.com/sjpdf.html?articlenum=st0060. The same
> can be downloaded as ssc install levpet
>
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