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RE: st: Average and count from a given number of previous observations


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Average and count from a given number of previous observations
Date   Tue, 11 Dec 2007 18:43:02 -0000

Orthogonal to this: I have some experience with rainfall
data. Daily rainfall is measured in mm. Units of ml make 
no sense physically. That may be a trivial typo on 
your part, but if not that correction may save you embarrassment 
in the future (at the cost of some embarrassment now). 

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

Scott Merryman

tssmooth ma average28 = rain, w(28)
tssmooth ma average28_2 = rain if rain !=0, w(28)
....

Patrick Woodburn

> I have weather data for a site in Uganda which I'm hope to compare to
> malaria data.  My rainfall data is a single variable, sorted by date,
> with no missing data, along the following lines:
>
> date           rainfall (ml)
> 01jan2003       12.7
> 02jan2003        3.0
>
> ...
>
> 31jun2007        1.3
>
> I would like to make four new variables for each date.  Two to
represent
> the total rainfall across the previous 28 days and across the previous
> 84 days, and two to represent the total number of days on which
> rainfall>0 out of the previous 28 or 84 days.   Could someone suggest
> how best to do this?

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