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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 19:20:48 +0000

Consider also this.

clear
  input q1 q2 q3
  2.05 .  .
  3.01 .  .
  0.75 .  .
  . 1.99  .
  . 1.86  .
  . 0.44  .
  . . 3.14159
  . . 2.71828
  . . 42
  end

 egen y = rowmax(q*)
 egen id = seq(), to(3)
 egen j = seq(), block(3)
 drop q*
 reshape wide y, i(id) j(j)

Nick
njcoxstata@gmail.com


On 2 December 2013 19:12, Nick Bornschein <nick.bornschein@gmail.com> wrote:
> Ok, thank you all. I will give that a try tomorrow.
> My real data "change" the column every 181 values, so q1 is in 1/181, q2 from 182/363 and so on..hop that will work... ;))
>
>
>
>> Am 02.12.2013 um 18:08 schrieb Nick Cox <njcoxstata@gmail.com>:
>>
>> <>
>>
>> I am just underlining that [_n+3] does the loop for you.
>>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>>> On 2 December 2013 16:51, Thomas, Anthony <anthony_h_thomas@brown.edu> wrote:
>>> sorry, thought you wanted to move observations from q1 to q2. The
>>> principle is the same though...
>>>
>>>> On Mon, Dec 2, 2013 at 11:35 AM, Nick Cox <njcoxstata@gmail.com> wrote:
>>>> 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.
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