[R] Boxplot BUT with Mean, SD, Max & Min ?
William Revelle
lists at revelle.net
Mon Sep 26 20:23:44 CEST 2011
Dear Phil,
An alternative solution is to draw a regular Tukey Box Plot but
overlay the means +/- 1 sd:
boxplot(anscombe)
psych:::error.bars(anscombe,sd=TRUE,add=TRUE)
Bill
At 3:45 AM +1000 9/27/11, Philip Rhoades wrote:
>Gabor, Bill,
>
>
>On 2011-09-27 02:51, Gabor Grothendieck wrote:
>>On Mon, Sep 26, 2011 at 12:11 PM, Philip Rhoades <phil at pricom.com.au> wrote:
>>>Gabor,
>>>
>>>
>>>On 2011-09-27 00:35, Gabor Grothendieck wrote:
>>>>
>>>>On Mon, Sep 26, 2011 at 9:56 AM, Philip Rhoades <phil at pricom.com.au>
>>>>wrote:
>>>>>
>>>>>People,
>>>>>
>>>>>It appears that there is no way of getting Boxplots to plot using Mean,
>>>>>SD,
>>>>>Max & Min - is there something else that would do what I want? I
>>>>>couldn't
>>>>>find it . .
>>>>>
>>>>
>>>>Try replacing the stats component of boxplot's output with your
>>>>desired statistics and then feeding that into the lower level bxp
>>>>function to do the graphics:
>>>>
>>>>bp <- boxplot(Nile, plot = FALSE)
>>>>bp$stats <- matrix(c(min(Nile), mean(Nile) + c(-1, 0, 1) * sd(Nile),
>>>>max(Nile)))
>>>>bxp(bp)
>>>
>>>
>>>Thanks for that! What is the syntax when there is more than one set of data
>>>(ie a two dimensional vector)? I tried messing around with stuff like:
>>>
>>> mean(Nile[,2] etc
>>>
>>>but I get subscript out of range errors . .
>>>
>>
>>Bill's example shows how to do it with a list of numeric vectors.
>>Here is another example using the built in anscombe and making use of
>>my prior code, Bill's and Vining's:
>>
>>bp <- boxplot(anscombe, plot = FALSE)
>>bp$stats <- sapply(anscombe, function(x) c(min(x), mean(x) + c(-1, 0,
>>1) * sd(x), max(x)))
>>bxp(bp, outline = FALSE)
>
>
>Interesting! - I've learnt something about anscombe and sapply and
>other stuff (thanks again!) but I think I mis-spoke before. I think
>what I want is a list of numeric vectors but when I created tarr:
>
> tarr <- array( dim = c( 5,3 ), c( 1,2,3,4,5,2,3,4,5,6,3,4,5,6,7 ) )
>
>I couldn't get it to work with the original code . . now I have had
>a closer look at Bill's code . .
>
>On the original question though, why isn't there something "off the
>shelf" that will do what I want? Surely, a "boxplot" using mean,
>SD, max and min would be a common enough need to justify it?
>
>Thanks,
>
>Phil.
>
>--
>Philip Rhoades
>
>GPO Box 3411
>Sydney NSW 2001
>Australia
>E-mail: phil at pricom.com.au
>
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