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st: RE: rearranging observations within a variable


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: rearranging observations within a variable
Date   Tue, 10 Feb 2004 16:52:06 -0000

correction

expand 2 
sort var 
replace var = . if mod(_n,2) == 0 

Nick 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: Nick Cox 
> Sent: 10 February 2004 16:49
> To: 'statalist@hsphsun2.harvard.edu'
> Subject: RE: rearranging observations within a variable
> 
> 
> expand 2 
> bysort var : replace var = . if _n == 2 
> 
> or 
> 
> expand 2 
> sort var 
> replace var = . if mod(_n,2) 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> > -----Original Message-----
> > From: owner-statalist@hsphsun2.harvard.edu
> > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of 
> > Daniel Mueller
> > Sent: 10 February 2004 16:17
> > To: Statalist
> > Subject: st: rearranging observations within a variable
> > 
> > 
> > Hi.
> > 
> > There's probably a neat trick to that, but can't find it...
> > 
> > I have one variable:
> >      +-----+
> >      | var |
> >      |-----|
> >   1. |   1 |
> >   2. |   3 |
> >   3. |   5 |
> >   4. |   7 |
> >   5. |   9 |
> >      |-----|
> >   6. |  11 |
> >   7. |  13 |
> >   8. |  15 |
> >   9. |  17 |
> >  10. |  19 |
> >      +-----+
> > 
> > The observations of this variable I want to rearrange to 
> > arrive at the following:
> >      +-----+
> >      | var |
> >      |-----|
> >   1. |   1 |
> >   2. |   . |
> >   3. |   3 |
> >   4. |   . |
> >   5. |   5 |
> >      |-----|
> >   6. |   . |
> >   7. |   7 |
> >   8. |   . |
> >   9. |   9 |
> >  10. |   . |
> >      +-----+
> > i.e. I have to -expand- the data set to get running 
> > observation numbers with missing values for observations, which were
> > previouly missing.
> > 
> > How can I do that??
> > 
> > Thanks a bunch in advance,
> > greetings,
> > Daniel
> > 
> > 
> > 
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> 

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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