[R] overlay of two sets of boxplots

[David Winsemius]

On Feb 20, 2012, at 1:59 PM, Mirjam Appel wrote:

>
> Hello John,
> Thanks for your fast answer. I will try to be clearer and more  
> detailed this time. At the moment I am importing a dataframe like  
> below as a '.csv file'. I want to generate a boxplot for M and F  
> values grouped by X whereby boxplots for M and F should be above or  
> very close to each other.  Please see attachment for example figure.  
> Till now I have tried a code that looks like the one below the frame  
> (I found it in the graph help of R for boxes close to each other):

I think you must have missed the spot in whatever example code you are  
following for your homework task where they reshaped this data so that  
it was in long format. Go back into your text and read it more  
carefully and if it's not clear, then pose further questions to your  
instructor.

>
> X	M	                 F
> Exp1	-90.0273224	-77.66531714
> Exp1	-73.33333333	-96.36363636
> Exp1	-98.24561404	-91.57848325
> Exp1	-65.2173913	-59.18367347
> Exp1	-98.7654321	-92.42424242
> Exp1	-96.42857143	-89.25925926
> Exp2	-84.61538462     -47.36842105
> Exp2	-43.63636364     -22.37762238
> Exp2	-47.5	               -33.33333333
> Exp2	-55.49450549	-66.66666667
>
>> boxplot(
>    formula = F~Strain,
>    data    = pain,
>    boxwex  = 0.25,
>    at      = 1:38 - 0.1,
>    subset  =supp== "F",

Clearly the "strain" variable was created in the process of reshaping  
and the "supp" variable as well.

-- 
david.

>    col     = "red",
>    xlab    = "Strain",
>    ylab    = " F"
>   			 )
> boxplot(
>    formula = M~Strain,
>    data    = pain,
>    boxwex  = 0.25,
>    at      = 1:38 + 0.1,
>    subset  =supp== "M",
>    col     = "orange",
>    add     = TRUE )
>
> ...but I did cannot find anywhere what supp means and R cannot read  
> it.
> I hope this is explained ok. Any kind of answer would help!
> Best
> Mirjam
>
> -----Original Message-----
> From: John Kane [mailto:jrkrideau at inbox.com]
> Sent: Monday, February 20, 2012 6:00 PM
> To: Mirjam Appel; r-help at r-project.org
> Subject: RE: [R] overlay of two sets of boxplots
>
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
> At a rough guess you may want to have a look at the mfrow in ?par   
> but without some sample data and a bit more information about what  
> you need it is difficult to suggest more.
>
> By the way dput (see ?dput) is a handy way to supply a sample data  
> set here.
>
> John Kane
> Kingston ON Canada
>
>
>> -----Original Message-----
>> From: appel at neuro.mpg.de
>> Sent: Mon, 20 Feb 2012 10:27:11 +0000
>> To: r-help at r-project.org
>> Subject: [R] overlay of two sets of boxplots
>>
>> Hello,
>> I am new to R and currently have the following problem:
>> I have successfully loaded my data in R which consists of two numeric
>> columns (LI_F and female) and one character column (Strain). So far I
>> can plot two different set of boxplots for each of the numeric  
>> columns
>> plotted by the groups of the character column and the commands look
>> like
>> that:
>>
>> boxplot(LI_F~Strain, ylab="LI_F", xlab="Strain", data=pain)
>> boxplot(female~Strain, ylab="female", xlab="Strain", data=pain)
>>
>> How can I overlay the two set of boxplots (preferably in different
>> colors), so that I can compare them one by one, meaning two boxplots
>> corresponding to the same character in "Strain" are directly above
>> each other?
>> I have tried a lot of things and would greatly appreciate your help.
>>
>> Best,
>> Mirjam
>>
>> 	[[alternative HTML version deleted]]
>>

David Winsemius, MD
West Hartford, CT