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~ Eric

__
Eric A. Booth
Public Policy Research Institute
Texas A&M University
ebooth@ppri.tamu.edu
Office: +979.845.6754



On Sep 17, 2010, at 2:54 AM, Kaspar Dardas wrote:

> Hello statalisters,
> 
> I have an unbalanced panel dataset with about 50 Variables and 30000
> observations between 2003 - 2010 in long format.
> I need to create a running rum variable"3m_sum_variable" which
> aggregates a certain variable (lets call it) "value" 3 months into the
> past. In other words, the variable "3m_sum_variable" should be the sum
> of all "value" variables which occurred in the last 3 months relative
> (and including) to the current observation.
> 
> I think I might create such a variable fairly easy with reshaping.
> However, since I have about 50 Variable I would rather work with my
> long format and create a loop which "goes back 3 months" into the past
> and aggregates the previous "value" variables. Does anybody know of a
> loop that can do this efficiently for an unbalanced panel datatset?
> 
> Best & thanks,
> 
> Kaspar
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