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Re: st: RE: growth rate


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: growth rate
Date   Wed, 10 Oct 2012 15:01:24 +0100

I do agree.

On Wed, Oct 10, 2012 at 2:57 PM, Justina Fischer <JAVFischer@gmx.de> wrote:
> Hi Nick,
>
> you are completely right and I have already posted a corection.
>
> actually, the question of 'growth rate' is rather a mathematical one, e.g. we have also growth rates in biology (populations), etc.
>
> Cheers
> Justina
> -------- Original-Nachricht --------
>> Datum: Wed, 10 Oct 2012 14:51:29 +0100
>> Von: Nick Cox <njcoxstata@gmail.com>
>> An: statalist@hsphsun2.harvard.edu
>> Betreff: Re: st: RE: growth rate
>
>> My economics is a bit rusty (last class was in 1969), but I guess
>> there is a division sign in there somewhere.
>>
>> On Wed, Oct 10, 2012 at 2:45 PM, Justina Fischer <JAVFischer@gmx.de>
>> wrote:
>> > HI,
>> >
>> > this is an approximation (Taylor), but not the exact growth rate.
>> >
>> > The growth rate is defined as : (GDP-L1.GDP)(GDP)
>> >
>> > Best
>> >
>> > Justina
>> > -------- Original-Nachricht --------
>> >> Datum: Wed, 10 Oct 2012 13:39:56 +0000
>> >> Von: "Swanquist, Quinn Thomas" <qswanqui@utk.edu>
>> >> An: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
>> >> Betreff: st: RE: growth rate
>> >
>> >> If you must use xtset to do this, you can create a new variable to
>> >> identify the year as follows:
>> >>
>> >> sort id year
>> >> by id: gen yearid = _n
>> >> xtset id yearid
>> >> gen growth=D.loggdp
>> >>
>> >> Alternatively you could use:
>> >>
>> >> sort id year
>> >> by id: gen growth = loggdp - loggdp[_n-1]
>> >>
>> >> Of course your growth rate is based on unbalanced panel data so you'll
>> >> need to consider that when using this variable for its intended
>> purpose.
>> >>
>> >> Quinn T. Swanquist
>> >> qswanqui@utk.edu
>> >>
>> >> -----Original Message-----
>> >> From: owner-statalist@hsphsun2.harvard.edu
>> >> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Lynn Lee
>> >> Sent: Wednesday, October 10, 2012 9:25 AM
>> >> To: statalist@hsphsun2.harvard.edu
>> >> Subject: st: growth rate
>> >>
>> >> Nick,
>> >>
>> >> My panel data has 4 years for each country,2007,2002,1997,1995. The gap
>> is
>> >> not same. Therefore, I do not know how to assign value to -delta()- in
>> >> -xtset-. I figured out why  Stata11 generated all missing values for
>> growth
>> >> rate. But the year gap is unbalanced. I tried -xtset id year,delta(5)-,
>> >> Stata11 told me "time values with period less than delta() found.
>> >>
>> >> Now, I replace "1995" with "1992" artificially, then I got the growth
>> >> rate.
>> >>
>> >> But is there any direct way (not need to replace the year artificially)
>> >> which can generates growth rate for unbalanced year gap panel data?
>> >>
>> >> I appreciate for your help.
>> >>
>> >> Best Regards,
>> >> Lynn Lee
>> >>
>> >>
>> >> -----Original Message-----
>> >> From: owner-statalist@hsphsun2.harvard.edu
>> >> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
>> >> Sent: Wednesday, October 10, 2012 8:49 PM
>> >> To: statalist@hsphsun2.harvard.edu
>> >> Subject: Re: st: growth rate
>> >>
>> >> -help xtset- explains about setting by panel and year. Once you have
>> done
>> >> that correctly
>> >>
>> >> gen growth=D.loggdp
>> >>
>> >> is sufficient.
>> >>
>> >>
>> >> On Wed, Oct 10, 2012 at 1:41 PM, Lynn Lee <lynn09v@gmail.com> wrote:
>> >>
>> >> > I use -bysort id: gen growth=D.loggdp- to generate growth rate of GDP
>> >> > in panel data. I also wrote -xtset year- before this command, but
>> >> > Stata11 told me "time variable not set". I am assuming this command
>> is
>> >> > only for time-series data. What about panel? What is the command used
>> >> > in panel to generate growth rate?
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>> >>
>> >>
>> >>
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>> > --
>> >
>> >
>> >
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