Re: st: How can I loop this?

[Nick Cox <njcoxstata@gmail.com>]

No need to loop.

Your question is an FAQ.

http://www.stata.com/support/faqs/data-management/replacing-missing-values/

Nick
njcoxstata@gmail.com


On 4 May 2013 21:23, Adam Guerrero <adamgue@gmail.com> wrote:
> Hi Stata Users,
>
> I have an unbalanced panel comprised of student years which can be
> reshaped into student terms (six years, three terms per year,
> providing a maximum 18 observations per student).  One of the
> variables included in the data is a student's major area of
> specialization - major1.
>
> For some students this variable is defined at the start of their
> educations, missing for a few years, then defined again.  After
> consulting with the registrar at the institution under analysis the
> following code was used to fill in the gaps
>
> by id: replace major1=major1[_n+1] if major1=="" & major1[_n+1]!="" & _n!=_N
> by id: replace major1=major1[_n+1] if major1=="" & major1[_n+1]!="" & _n!=_N
> by id: replace major1=major1[_n+1] if major1=="" & major1[_n+1]!="" & _n!=_N
> by id: replace major1=major1[_n+1] if major1=="" & major1[_n+1]!="" & _n!=_N
> by id: replace major1=major1[_n+1] if major1=="" & major1[_n+1]!="" & _n!=_N
>
> In other words, I had to type the same line of code over and over
> until all of the values were replaced.  My question is whether there
> is a more efficient way to do this?  I'm relatively new to Stata, so
> any advice would be very much appreciated.
>
> Adam Antonio
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