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st: RE: rearranging observations within a variable


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: rearranging observations within a variable
Date   Tue, 10 Feb 2004 16:49:27 -0000

expand 2 
bysort var : replace var = . if _n == 2 

or 

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

Nick 
[email protected] 

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]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
> 
> 
> 
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