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Re: st: Loop to replace values of a variable


From   emanuele mazzini <madsoenistata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Loop to replace values of a variable
Date   Wed, 18 Dec 2013 15:04:44 +0100

Yes, the way Marteen suggested worked greatly.
Thank you!!

2013/12/18 Fabrizio Colella - 1348010 <colella.fabrizio@studbocconi.it>:
> you generated x as Marteen suggested, now you just have to subtract:
>
> gen x = _n*.1
> gen y = -2.6+x
>
> Fabrizio
>
>
> ----- Messaggio originale -----
> Da: "Nick Cox" <njcoxstata@gmail.com>
> A: statalist@hsphsun2.harvard.edu
> Sent: Mercoledì, 18 dicembre 2013 14:49:34
> Oggetto: Re: st: Loop to replace values of a variable
>
> For -2.5(0.1)2.1 or -2.5(0.1)2.5, you can still divide integers by 10.
> No loop needed as _n always gives you integers in sequence.
>
>
> Nick
> njcoxstata@gmail.com
>
>
> On 18 December 2013 13:44, emanuele mazzini <madsoenistata@gmail.com> wrote:
>> Oh, yes, I see. Thank you very much for your answers, but I may have
>> oversimplified, since what you said would fit in this case, as x is
>> exactly = _n/10, but my problem is slightly more complex.
>>
>> What if the values I want to replace go from -2.5 to 2.15, still with
>> a 0.1 interval? In this case I'd still need a loop, right?
>>
>> 2013/12/18 Maarten Buis <maartenlbuis@gmail.com>:
>>> no need to loop:
>>>
>>> gen x = _n*.1
>>>
>>> Hope this helps,
>>> Maarten
>>>
>>>
>>> On Wed, Dec 18, 2013 at 2:33 PM, emanuele mazzini
>>> <madsoenistata@gmail.com> wrote:
>>>> Dear all statalist users,
>>>>
>>>> I would like to program a (relatively) simple loop to replace the
>>>> values of a variable I created, but I cannot  figure it out how to
>>>> write the syntax.
>>>>
>>>> The structure of my data is very simple:
>>>> I have 300 observations and a variable, say x, that in the first cell
>>>> (i.e. for n=1) is equal to 0.1, while it is missing for all other 299
>>>> cells. Data look like:
>>>>
>>>> n     x
>>>> 1    0.1
>>>> 2     .
>>>> 3     .
>>>> 4     .
>>>> .
>>>> .
>>>> .
>>>> .
>>>> .
>>>> 299  .
>>>> 300  .
>>>>
>>>> I would like the loop to replace the missing values of my variable by
>>>> going from cell 2 to cell 300, and to have a replace that would be at
>>>> a 0.1 intervals, so as to obtain data that look like:
>>>>
>>>> n     x
>>>> 1    0.1
>>>> 2    0.2
>>>> 3    0.3
>>>> 4    0.4
>>>> .
>>>> .
>>>> .
>>>> .
>>>> .
>>>> 299  29.9
>>>> 300  30
>>>>
>>>> I can obviously do it by hand, but a loop would be naturally much more
>>>> efficient!
>>>> Does anyone know how to make it?
>>>>
>>>> Thank you in advance.
>>>> *
>>>> *   For searches and help try:
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>>>
>>>
>>>
>>> --
>>> ---------------------------------
>>> Maarten L. Buis
>>> WZB
>>> Reichpietschufer 50
>>> 10785 Berlin
>>> Germany
>>>
>>> http://www.maartenbuis.nl
>>> ---------------------------------
>>> *
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