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st: growth rate

From   "Lynn Lee" <>
To   <>
Subject   st: growth rate
Date   Wed, 10 Oct 2012 21:24:49 +0800


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-----
[] On Behalf Of Nick Cox
Sent: Wednesday, October 10, 2012 8:49 PM
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 <> 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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