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Re: st: reshaping + info from label


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: reshaping + info from label
Date   Tue, 25 Oct 2011 01:59:12 +0100

That made it clearer. You can do this

clear
input date str1 variable1ab  str1 variable2cd
1      q                         w
2      e                         r
end
label var variable1ab "A B"
label var variable2cd "C D"
save aroratest
longshape variable*, i(date) j(whatever)

. l

     +-----------------------------------+
     | date   whatever     _whatever   y |
     |-----------------------------------|
  1. |    1        A B   variable1ab   q |
  2. |    1        C D   variable2cd   w |
  3. |    2        A B   variable1ab   e |
  4. |    2        C D   variable2cd   r |
     +-----------------------------------+

It then sounds like a case for -split- on -whatever-.

The key to this solution was posted fairly recently, -longshape- from SSC.

-ds- and -findname- find variable names, but string values within the
data are not where it looks. I still see no connection with this
problem, despite being very familiar with both commands, but if
-longshape- helps with a solution, I guess that is immaterial.

Nick


On Tue, Oct 25, 2011 at 1:46 AM, Abhimanyu Arora
<abhimanyu.arora1987@gmail.com> wrote:

> Thanks Nick, let me pls elaborate the problem.
> The reason why -ds- or your -findname- come into the picture is
> because I would like to take some strings out of the variable label
> and place them into the data.
> So let us consider only one variable variable1ab. "A B" is the
> variable label for the variable variable1ab and I would like to create
> 2 new variables taking up the values (two strings from the label) A
> and B and the third variable takes up the original value of the
> variable. The reason for all this is that I would eventually like to
> take some correlations -by- A and B (this information is available in
> the variable label).
>
> On Tue, Oct 25, 2011 at 2:10 AM, Nick Cox <njcoxstata@gmail.com> wrote:
>> You don't show what you tried with -reshape-. If these were string
>> variables, then you can go
>>
>> input date str1 variable1ab  str1 variable2cd
>> .  1      q                         w
>> .  2      e                         r
>> end
>> reshape long variable, i(date) string
>> l
>>
>>     +-----------------------+
>>     | date    _j   variable |
>>     |-----------------------|
>>  1. |    1   1ab          q |
>>  2. |    1   2cd          w |
>>  3. |    2   1ab          e |
>>  4. |    2   2cd          r |
>>     +-----------------------+
>>
>> I don't follow what you are trying to explain about labels. Value
>> labels? Variable labels? Nor do I follow what the connection with -ds-
>> or -findname- (SJ) is here.
>>
>> Nick
>>
>> On Tue, Oct 25, 2011 at 12:11 AM, Abhimanyu Arora
>> <abhimanyu.arora1987@gmail.com> wrote:
>>
>>> I am trying to reshape data that has the following form---
>>>
>>> date variable1ab   variable2cd
>>> 1      q                         w
>>> 2      e                         r
>>>
>>>
>>>
>>> Assume the variable variable1ab is labelled A B, while variable2cd is
>>> labelled C D (actually strings, though)
>>>
>>>
>>> Finally I would like the data to be of the following form
>>>
>>> date var1 var2 value
>>> 1      A    B      q
>>> 2      A    B      e
>>> 1      C    D      w
>>> 2      C    D      r
>>>
>>>
>>> I feel the solution might lie in the commands -ds- or Nick Cox's
>>> -findname- together with -reshape- but I am just unable to see how.

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