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RE: st: Replacing observations with values from other observations


From   "Pounds, Moses A." <MAPounds@bcps.k12.md.us>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Replacing observations with values from other observations
Date   Mon, 3 Jun 2013 09:26:52 -0400

Thanks Ryan! Using observation numbers in brackets mostly gets the job done. Unfortunately, there is not a one-to-one correspondence between my obsID variable and Stata's own observation numbers. Accordingly it would make my code easier to write (and for others to later read) if there were some way of using an expression identifying the observation number by criteria (e.g. "if obsID==374474"), in place of Stata's observation number. Does anyone know of a way of doing that?

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Ryan Stevens
Sent: Friday, May 31, 2013 4:42 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Replacing observations with values from other observations

Moses,

To reference observations in Stata you use [#] after your variable, so observation number 6 for var1 can be accessed as var1[6]. Now you have to remember your obsID variable and the observation number according to Stata may be different. So your code could look like:

replace var1 = var1[6] if obsID==5

This replaces the var1 with the value of var1 at Stata observation 6 if obsID==5. Now this could all be simplified if obsID matches Stata's observation numbers. If there is a one-to-one mapping of obsID to Stata's observation numbering you can do this as

replace var1 = var1[6] in 5

This replaces the value of observation 6 at observation 5.

Ryan

On Fri, May 31, 2013 at 4:31 PM, Pounds, Moses A.
<MAPounds@bcps.k12.md.us> wrote:
> Hello everyone,
>
> I would like to replace specific observations with values from other 
> observations. I can use
>
> replace var1 = 500 if obsID==5
>
> to replace the value for variable 1 in the observation with ID number 
> 5, with the quantity 500. What I would like is code that allows me to 
> make a reference to another observation, in place of that "500." Does 
> anyone have a way to do this? (My option of last resort is to do this 
> in Excel, but I would prefer to keep working in Stata.)
>
> Thanks in advance for any help you can give, Moses
>
> ----------------------------------------
> Moses A. Pounds
> Program Evaluator
> Baltimore City Public Schools
> Office of Achievement and Accountability
>
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