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Re: st: copying a string variable to all rows within a group
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: copying a string variable to all rows within a group
Date
Wed, 29 Feb 2012 09:01:01 +0000
For "row" read "observation". We know what you mean, but that is the
correct Stata terminology.
bysort groupvar (oldvar) : replace oldvar = oldvar[_N]
Alternatively,
bysort groupvar : replace oldvar = oldvar[1]
will probably work too. Alternatively,
bysort groupvar : replace oldvar = oldvar[_n-1] if missing(oldvar) & _n > 1
will probably work too. This last is an FAQ
FAQ . . . . . . . . . . . . . . . . . . . . . . . Replacing missing values
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox
2/03 How can I replace missing values with previous or
following nonmissing values?
http://www.stata.com/support/faqs/data/missing.html
On Wed, Feb 29, 2012 at 8:28 AM, <[email protected]> wrote:
,
> If I have a numeric variable "oldvar" which appears on only the first row of a set of rows defined by a group variable "groupvar" (rest of oldvar rows are blank), it is easy enough to copy oldvar down all rows within groupvar:
>
> bysort groupvar: egen newvar=max(oldvar) // can equally use =min(oldvar) as there is only 1 value of oldvar.
>
> How might I do the same to copy a string oldvar to all rows - again it only appears once within the group, but not necessarily on the first row.
>
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