[R] Histogram over times (without dates)

[Clint Bowman]

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 at ihc.com
> (801) 408-8111
> 
> >>> "Dubravko Dolic" <Dubravko.Dolic at komdat.com> 03/24/05 09:38AM >>>
> Dear Group,
> 
> Having a character vector like this one:
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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"
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> 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).
> 
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> 
> have a goof Easter holiday
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> 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
> 
> Fax:     +49 (0)89-55 27 44 - 2463
> 
> Email: dubravko.dolic at komdat.com      
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-- 
Clint Bowman			INTERNET:	clint at ecy.wa.gov
Air Quality Modeler		INTERNET:	clint at math.utah.edu
Department of Ecology		VOICE:		(360) 407-6815
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