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Re: st: Average when -inrange()-


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Average when -inrange()-
Date   Fri, 18 Nov 2011 08:48:17 +0000

If -price- is never missing, using the -count- command is redundant,
as r(N) from -summarize- gives the same count.

Nick

On Fri, Nov 18, 2011 at 8:30 AM, Joseph Monte <hmjc66@gmail.com> wrote:
> Thanks, Nick. I think I got it!
>
> sort group date2
> gen count1=.
> gen mean1=.
> qui forval i = 1/`=_N'{
>      count if group==group[`i'] &
> inrange(date2,ninetydaysbefore[`i'],date1[`i'])
>      replace count1 = r(N) in `i'
>      summarize price if group==group[`i'] &
> inrange(date2,ninetydaysbefore[`i'],date1[`i'])
>      replace mean1 = r(mean) in `i'
>      }
>
> Joe
>
>
> On Thu, Nov 17, 2011 at 11:33 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> Just use the same -if- condition together with -summarize-. Same idea
>> of initialising a variable before the loop and -replace- within the
>> loop.
>>
>> Nick
>>
>> On Thu, Nov 17, 2011 at 10:06 PM, Joseph Monte <hmjc66@gmail.com> wrote:
>>> Dear Statalisters,
>>>
>>> The code below gives me the number of observations (i.e. count1) when
>>> "date2" occurs between two dates - "ninetydaysbefore" and "date1" -
>>> based on "group". I also need the average of another variable called
>>> "price" of the observations that are counted. I am not sure how to
>>> incorporate it within the loop below.
>>>
>>> sort group date2
>>> gen count1=.
>>> qui forval i = 1/`=_N'{
>>>    count if group==group[`i'] & inrange(date2,ninetydaysbefore[`i'],date1[`i'])
>>>        replace count1 = r(N) in `i'
>>>        }
>>>
>>> I am using Stata 12.
>>>

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