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RE: st: RE: problem levpet command


From   pim de Nijs <pimdenijs@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: problem levpet command
Date   Thu, 11 Dec 2008 19:31:33 +0100

Dear Martin Weiss,
 
Thanks for your answer. 
 
. set tr on
 
Then I got a whole list. I will copy the part where it goes wrong:
 
- sort `panel' `timevar'
  = sort __000003 Year
  - if "`panel'" != "" {
  = if "__000003" != "" {
  - local bypfx "by `panel': "
  = local bypfx "by __000003: "
  - }
  - tempvar timedif
  - qui `bypfx' gen long `timedif' = `timevar'[_n+1] - `timevar'
  = qui by __000003:  gen long __000004 = Year[_n+1] - Year
  - qui sum `timedif', meanonly
  = qui sum __000004, meanonly
  - if r(min) == 0 {
  - if "`panel'" != "" {
  = if "__000003" != "" {
  - di in red "repeated time values within panel"
repeated time values within panel
  - }
  - else di in red "repeated time values in sample"
  - exit 451

My knowledge about Stata is limited so I do not know what all these codes mean. Can you please help me one more time?
 
Thanks for your reply,
 
Pim


> From: martin.weiss1@gmx.de
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: problem levpet command
> Date: Thu, 11 Dec 2008 17:58:40 +0100
> 
> Line for the server...
> 
> As always in such situations, -set tr on- and see where the thing gets stuck
> (or let the list know)...
> 
> HTH
> Martin
> 
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of pim de Nijs
> Sent: Thursday, December 11, 2008 5:46 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: problem levpet command
> 
> 
> Hello,
> 
> My knowledge about Stata is limited and a feel ashamed that i have to bother
> you with my question because maybe I just made a stupid mistake in the
> command that I use. But I really do not know how I can solve the problem and
> I could not find a solution on the internet. 
> 
> I want to use the following command:
> 
> . levpet logSales, free(logEmployees) proxy(logMaterials)
> capital(logCapital) i(number) t(Year) revenue 
> 
> I get the following error:
> 
> repeated time values within panel
> r(451);
> 
> I have no idea why i get the ''repeated time values within panel'' error. I
> am 100% sure that there are no duplicates:
> 
> . dupliactes list Year number
> 
> result: no observations are duplicates
> 
> By only using a part of my dataset i get an idea what the problem is:
> 
> . levpet logSales if (NACE<=1531), free(logEmployees) proxy(logMaterials)
> capital(logCapital) i(number) t(Year) revenue 
> 
> Now I get the results of the levpet command. However there is something
> strange:
> 
> 
> Dependent variable represents revenue. Number of obs = 148
> Group variable (i): number Number of groups = 5756
> Time variable (t): Year
> Obs per group: min = 1
> avg = 4.1
> max = 5
> 
> 
> The number of observations is 148 and the number of groups is 5756? Then I
> see that the average number of observations per group is 4.1 This means that
> the number of groups should be 36 and not 5756.
> 
> I really have know idea what is going wrong. I just like to get the levpet
> results for my whole dataset. The . help levpet command do not give me the
> answer. Others papers that I have read and that are using the levpet command
> are telling that it is straightforward to use the levpet command. 
> 
> Can someone help me
> 
> Yours sincerely
> 
> Pim 
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