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Re: st: Is it necessary to have some variable for exposure in xtnbreg


From   Indu Khurana <indu.statauser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Is it necessary to have some variable for exposure in xtnbreg
Date   Wed, 15 Sep 2010 10:13:59 -0400

Thanks Steve !!

On Wed, Sep 15, 2010 at 9:00 AM, Steve Samuels <sjsamuels@gmail.com> wrote:
> --
> An exposure variable is an option, not a requirement.
>
> Steve
>
> Steven J. Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax:    206-202-4783
>
> On Tue, Sep 14, 2010 at 8:33 PM, Indu Khurana <indu.statauser@gmail.com> wrote:
>> Dear Statalisters,
>>
>> I have a count data on number of patents which is the dependent
>> variable (panel setting). Right hand side variables include Employee
>> well being and debt-equity ratio. The data on patents has a lot of
>> zeros. Although ZINB could have been an option but I am using fixed
>> effects. Therefore I decided to settle with negative binomial, fixed
>> effects - xtnbreg
>>
>> My question is: Is it necessary to have some variable for exposure in xtnbreg?
>>
>> The data is on 5000 firms for 5 years which all came into existence at
>> the same time in 2004. So basically they all have the same exposure.
>> And there is no information on month of the the year.
>> There is no other time dimension which can be used to fit in exposure.
>>
>> I was thinking of the following options:
>>  1. To ignore exposure variable all together
>>      Which I am not sure of whether it is correct.
>> 2. To include number of years of owner's education to fill as exposure.
>>
>>
>>
>> Please suggest.
>>
>> Thanks
>>
>> Indu Khurana
>>
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