st: taking the average of duplicate observations

[Michael Tekle Palm <mickilinen@hotmail.com>]

Hello Statalist!

I have observations with identical time values but different outcome values. Instead of dropping all but the first observations for every two/three duplicates, I want to calculate and replace with the average of the observations, and then drop the duplicates.

So my data is on rainfall for a given location and is disaggregated by year and month. E.g:

Station  |  Year  |  Month  |  Rainfall
---------------------------------------
    1       1980       1          5
    1       1980       1          3          
    1       1980       2          4
    1       1980       3          8
    1       1980       3          1


So for each duplicate by station year month, I would like to calculate the average value for the rainfall outcomes, use this value and drop all duplicates. I think the solution suggested in this ["RE: st: questions about duplicate observations"] Statalist reply may work, but I wasn't quite able to make it work.


Thanks a lot,

Mike 		 	   		  
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