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: [email protected]
> To: [email protected]
> 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: [email protected]
> [mailto:[email protected]] On Behalf Of pim de Nijs
> Sent: Thursday, December 11, 2008 5:46 PM
> To: [email protected]
> 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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