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RE: st: aggregate by high frequency data


From   tashi lama <ltashi32@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: aggregate by high frequency data
Date   Wed, 27 Jun 2012 16:44:54 +0000

awesome. Thanx



----------------------------------------
> Date: Wed, 27 Jun 2012 18:16:36 +0200
> Subject: Re: st: aggregate by high frequency data
> From: maartenlbuis@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> On Wed, Jun 27, 2012 at 5:39 PM, tashi lama wrote:
> > If I want to aggregate hits per day, then I would do sth like
> >
> > gen daily=dofc(read_date)
> >
> > collapse (sum) hits, by(daily)
> >
> > Does anyone have any idea aggregating per min or per hr or per sec for that matter? There doesn't seem to have a date-related command to do that both in manual and help?
>
> see -help datetime-, in particular the section labeled "Extracting
> time-of-day components from SIFs"
>
> *------------- begin example ------------------
> clear
> input str18 read_date byte hits
> "04jan2011 01:01:41" 1
> "04jan2011 01:03:07" 1
> "04jan2011 01:04:06" 1
> "04jan2011 01:08:21" 1
> "04jan2011 01:09:28" 1
> "04jan2011 01:58:34" 1
> "04jan2011 02:05:04" 1
> "04jan2011 02:16:45" 1
> "04jan2011 02:18:06" 1
> "04jan2011 02:22:34" 1
> end
>
> gen double date = clock(read_date, "DMYhms")
> format date %tc
> gen float daily = dofc(date)
> format daily %td
> gen byte hourly = hh(date)
>
> collapse (sum) hits, by(daily hourly)
> list
> *-------------- end example -------------------
> (For more on examples I sent to the Statalist see:
> http://www.maartenbuis.nl/example_faq )
>
>
> -- Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
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