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Re: Re: Re: st: creating new variable


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: Re: Re: st: creating new variable
Date   Thu, 13 Oct 2011 13:48:16 +0100

The code worked for me. You must be careful not to split lines.

count if gvkey == gvkey[`i'] & inrange(appyear, appyear[`i'] -5,
appyear[`i'] -1 )

is all one command. If that is not the explanation, then I can only
suggest that you copied the code incorrectly.

On Thu, Oct 13, 2011 at 1:43 PM, S.H. Former <S.H.Former@uvt.nl> wrote:
> Again thanks for your help! Stata gives the code: too few ')' or ']', r(132). I have looked at the command but couldn't really find a fault in it but I must say that I am not the biggest expert in it ;) Maybe you know why it is giving me this error?
>
> kind regards,
>
> Sytze
>
>
> -----Original Message-----
> From: Nick Cox <njcoxstata@gmail.com>
> To: statalist@hsphsun2.harvard.edu
> Date: Thu, 13 Oct 2011 12:26:44 +0100
> Subject: Re: Re: st: creating new variable
>
> Try
>
> gen count = 0
>
> qui forval i = 1/`=_N' {
>        count if gvkey == gvkey[`i'] & inrange(appyear, appyear[`i'] -5,
> appyear[`i'] -1 )
>        replace count = r(N) in `i'
> }
>
> This is clumsy and will execute slowly, but the logic should be easy to follow.
>
> Nick
>
> On Thu, Oct 13, 2011 at 12:13 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> You are quite right; I overlooked the more difficult bit which was
>> clearly stated.
>>
>> Some technique is discussed at
>>
>> SJ-7-3  pr0033  . . . . . . . . . . . . . .  Stata tip 51: Events in intervals
>>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>>        Q3/07   SJ 7(3):440--443                                 (no commands)
>>        tip for counting or summarizing irregularly spaced
>>        events in intervals
>>
>> That's accessible to you via the Stata Journal website.
>>
>> On Thu, Oct 13, 2011 at 11:58 AM, S.H. Former <S.H.Former@uvt.nl> wrote:
>>
>>> Thanks ver much for your reaction,
>>>
>>> The only thing what remains unknown for me is how to count only the observations from the last five years for each gvkey. I have looked at the tutorial you included but still I couldn't really find out!
>>>
>>> best regards,
>>>
>>> Sytze
>>>
>>> -----Original Message-----
>>> From: Nick Cox <njcoxstata@gmail.com>
>>> To: statalist@hsphsun2.harvard.edu
>>> Date: Wed, 12 Oct 2011 18:10:42 +0100
>>> Subject: Re: st: creating new variable
>>>
>>> Yes, it's possible. Here's one way
>>>
>>>  bysort gvkey (appyear) : gen newvar = _n-1 if appyear != appyear[_n-1]
>>>  bysort gvkey : replace newvar = newvar[_n-1] if missing(newvar)
>>>
>>> See
>>>
>>> SJ-2-1  pr0004  . . . . . . . . . . Speaking Stata:  How to move step by: step
>>>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>>>        Q1/02   SJ 2(1):86--102                                  (no commands)
>>>        explains the use of the by varlist : construct to tackle
>>>        a variety of problems with group structure, ranging from
>>>        simple calculations for each of several groups to more
>>>        advanced manipulations that use the built-in _n and _N
>>>
>>> and
>>>
>>> FAQ     . . . . . . . . . . . . . . . . . . . . . . . Replacing missing values
>>>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>>>        9/05    How can I replace missing values with previous or
>>>                following nonmissing values or within sequences?
>>>                http://www.stata.com/support/faqs/data/missing.html
>>>
>>> for the ideas behind the first and second commands.
>>>
>>> Nick
>>>
>>>

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