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Re: st: looping over observations in a single variable
From
Abhimanyu Arora <[email protected]>
To
[email protected]
Subject
Re: st: looping over observations in a single variable
Date
Mon, 12 Jul 2010 19:48:28 +0200
One strategy could be to use -duplicates drop- and making use of
[_n+1] or [_n-1] in the -if- option.
On Mon, Jul 12, 2010 at 7:36 PM, Casey P. Durand <[email protected]> wrote:
> Hi folks,
>
> I'm trying to figure out how to loop over sets of observations within
> a single variable. Basically, I've got a variable which contains
> dates. There are about 15 observations with one date, then another 15
> with the next days date, and so on, for a total of about 7 days. Each
> individual observation also contains two other variables with GPS
> coordinates in them. However, in some cases, some dates were copied
> and pasted in between other dates, creating some interruptions in the
> data. I'm attempting to find a way to ID those inserted segments. To
> visually describe this, a generic example would be something like
> this:
>
> Var1
> ------
> Z1
> Z1
> Z2
> Z2
> Z3
> Z3
> Z1
> Z1
> Z4
> Z4
>
> In this example, the parts I want to flag and, if possible, delete,
> are the Z1s between the Z3s and Z4s.
>
> I'm having a tough time doing this for observations within a single
> variable. Does anyone know how to do this in Stata?
>
> Thanks in advance,
>
> Casey
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