st: RE: growth rate

["Swanquist, Quinn Thomas" <qswanqui@utk.edu>]

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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