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st: problem levpet command


From   pim de Nijs <pimdenijs@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: problem levpet command
Date   Thu, 11 Dec 2008 17:46:01 +0100

 
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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