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Re: st: "stacking" a variable ?


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: "stacking" a variable ?
Date   Mon, 2 Dec 2013 16:35:46 +0000

An explicit loop is unnecessary, as

replace q2 = q2[_n+3] in 1/3

encapsulates the loop. Subscripting should be familiar in terms of
e.g. [_n-1] for previous observation.

Nick
njcoxstata@gmail.com


On 2 December 2013 16:28, Thomas, Anthony <anthony_h_thomas@brown.edu> wrote:
> Hi Nick,
>
> You can try using Stata's subscript notation "_n":
>
> replace q2 = q1[4] if _n == 1
> replace q2 = q1[5] if _n == 2
>
> *** where 4 and 5 are the observation number of what you want to move in q1
>
> and so on. Of course it would be smarter to implement this in a loop
> if possible.
>
> Hope that helps,
>
> Anthony
>
> On Mon, Dec 2, 2013 at 11:03 AM, Nick Bornschein
> <nick.bornschein@gmail.com> wrote:
>> Hello,
>>
>> after some problems with my data, I have a final question to deal with them. Imagine the following example:
>>
>> clear
>> input q1 q2
>> 2.05 .
>> 3.01 .
>> 0.75 .
>> . 1.99
>> . 1.86
>> . 0.44
>> end
>>
>> How do I "move" column q2 upwards, so that finally 1.99 is in the same line as 2.05 in the first row, 1.86 is besides 3.01 and so on.
>>
>> Thanks a lot
>> -Nick
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