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st: How can I loop this?


From   Adam Guerrero <adamgue@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: How can I loop this?
Date   Sat, 4 May 2013 16:23:34 -0400

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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