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st: RE: Producing averages for cross sectional data by ID


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Producing averages for cross sectional data by ID
Date   Fri, 21 Apr 2006 18:56:55 +0100

Sorting by farmer ID is not necessary. You can
get the averages with a suitable -egen, mean()- 
and -by()- or -by:-. 

Nick 
n.j.cox@durham.ac.uk 

Gauri Khanna
 
> I would like to produces averages in my cross sectional data and was 
> wondering how to do it.
> 
> I have cross sectional data on 300 plots for 100 farmers. 
> Each plot is 
> associated with a farmer's identification. Hence the same 
> farmer can have 
> multiple plots.
> 
> I would like to estimate the following production function for my 100 
> farmers:
> 
> (Yi-Yibar)=(X1i-X1ibar)+(X2i-X2ibar)+(X3i-X3ibar)+....
> 
> where i= ith farmer, Y = output, and X1i,X2i...'s= various 
> inputs of the ith 
> farmer,
> 
> Yibar=average output of ith farmer calculated over his multiple plots,
> X1ibar=average of input1 of ith farmer calculated over his 
> multiple plots 
> etc.
> 
> How can I select the ith farmer from my data and calculate 
> averages? Note 
> that each farmer has a farmerID
> 
> I know that I must sort the data by "farmerID" but what comes after?

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