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st: xtfrontier question

From   "Yaseen Ghualm" <[email protected]>
To   [email protected]
Subject   st: xtfrontier question
Date   Thu, 09 Dec 2004 12:21:39 -0000

Dear Stata users
 I am estimating efficiency in agriculture. I am using cross section data and some 
values of two explanatory varaibles are zero. Due to zero values I am unable to take log 
of regressors and when I use xtfrontier with unticking time varaibles for panel setting I 
am getting the message insufficient observations. There are 30 observations in my 
sample. I wonder is this due to zero values or not taking logs of variables or my sample 
size is too low. I will highly appreciate help for my question.
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