R help - Jan 2012 - Histogram: plot by group

I want to make a histogram in R of the data in attached excel file called
'cbt'. However, I need the histogram to show a separation for Group 1
and
Group 2, as in attached image. 

How do I do this in R? I know how to make a histogram for a single group,
but how can I separate the 2 groups?

http://r.789695.n4.nabble.com/file/n4256052/hist.jpg 

http://r.789695.n4.nabble.com/file/n4256052/cbt.xls cbt.xls 

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Nameless,

http://had.co.nz/ggplot2/geom_histogram.html has a few examples

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more than
asking him to perform a post-mortem examination: he may be able to say what the
experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure
that a reasonable answer can be extracted from a given body of data.
~ John Tukey


-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Layo909
Verzonden: dinsdag 3 januari 2012 8:58
Aan: r-help at r-project.org
Onderwerp: [R] Histogram: plot by group

I want to make a histogram in R of the data in attached excel file called
'cbt'. However, I need the histogram to show a separation for Group 1
and Group 2, as in attached image.

How do I do this in R? I know how to make a histogram for a single group, but
how can I separate the 2 groups?

http://r.789695.n4.nabble.com/file/n4256052/hist.jpg 

http://r.789695.n4.nabble.com/file/n4256052/cbt.xls cbt.xls 

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> I want to make a histogram in R of the data in attached excel file called
> 'cbt'. However, I need the histogram to show a separation for Group
1 and
> Group 2, as in attached image.
>
> How do I do this in R? I know how to make a histogram for a single group,
> but how can I separate the 2 groups?
>
Hi Layo909,
Have a look at the barp function (plotrix) example for a multiple histogram.

Jim