Re: [R] Histogram over times (without dates)

From: Clint Bowman <clint_at_ecy.wa.gov>
Date: Fri 25 Mar 2005 - 04:50:19 EST


I do analyses of that sort all the time with air quality data where I wish to begin to understand daily behavior -- works well in doing model evaluation as well.

I'd say your approach should give you useful information; however, I'd think you'd also be interested in a possible day of week variation.

On Thu, 24 Mar 2005, Greg Snow wrote:

> Have you looked at the "CircStats" and "circular"? They have some plotting functions that may be of help to you.
>
> Greg Snow, Ph.D.
> Statistical Data Center
> greg.snow@ihc.com
> (801) 408-8111
>
> >>> "Dubravko Dolic" <Dubravko.Dolic@komdat.com> 03/24/05 09:38AM >>>
> Dear Group,
>
> Having a character vector like this one:
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>
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> [1] "03:38:55" "07:42:38" "08:04:27" "08:17:13" "08:41:14" "08:46:58"
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> [7] "08:47:11" "08:53:51" "08:57:51" "08:58:56"
>
>
>
> I try to do a histogram over times of a day. All I want to know, if my solution is proper or if there is another way to go.
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> There is no Information about the day on which this time occurred. it is unimportant as I want to know at what times on a day a costumer buys anything (times are collected from logfiles).
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> The values span 24 hours (e.g. 00:00:00 to 23:59:59)
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>
>
> I converted the characters to chron objects (library(chron)) and then to numeric vectors:
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> ordertm.num <- as.numeric(chron(times = ecom$Ordertime))
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> Then I put the numeric values to hist(), printed the hist without axes=F and constructed my own axis.
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> The result is satisfactory. But as there are so many possibilities with times on R (namely using the POSIX classes) I want to be shure if there is no "standard" approach to handle such time related problems (note that the date is irrelevant to my problem).
>
>
>
> have a goof Easter holiday
>
>
>
> All the best
>
>
>
> Dubravko Dolic
>
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> Dubravko Dolic <http://www.dolic.de/pagedd.html>
>
> -- Statistik --
>
> Tel: +49 (0)89-55 27 44 - 4630
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> Email: dubravko.dolic@komdat.com
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-- 
Clint Bowman			INTERNET:	clint@ecy.wa.gov
Air Quality Modeler		INTERNET:	clint@math.utah.edu
Department of Ecology		VOICE:		(360) 407-6815
PO Box 47600			FAX:		(360) 407-7534
Olympia, WA 98504-7600

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Received on Fri Mar 25 05:00:56 2005

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