st: Producing averages for cross sectional data by ID

["Gauri Khanna" <gwkhanna@hotmail.com>]

Dear StataList,

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?

Thank you in advance.

Sincerely,

Gauri Khanna

PS. Sorry for cross posting but I did not receive this message in my inbox 
so perhaps nor did the rest of you.

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