R help - Mar 2012 - How to create interrupted boxplot

Hello,

I have created two boxplots with following R code. There is one outlier in
B group.
The outlier is 33. But the all other data are between 0 to 4.

How can I skip y-axis around 5 to 25, and expand 0-4 for this case. Also I
want keep the outlier in my boxplot.
I want my boxplot look like the second one, keep the outlier, and make an
interrupt of y-axis from 5 to 25.

Thanks,
Jianghong


Example = c( 0.00,0.33,0.75,3.00,2.50,0.50,2.00,33.00)
Grp_Example
=c("A","A","A","B","B","B","B","B")

Example_Data= cbind(Example,Grp_Example)
attach(Example_Data)


boxplot(Example ~ Grp_Example,main=paste("Boxplot of Example"),
pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25))

boxplot(Example ~ Grp_Example,main=paste("Boxplot of
Example"),ylim=c(0,4),
pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25))

	[[alternative HTML version deleted]]

Jianghong wrote:
> Hello,
> 
> I have created two boxplots with following R code. There is one
outlier in
> B group.
> The outlier is 33. But the all other data are between 0 to 4.
> 
> How can I skip y-axis around 5 to 25, and expand 0-4 for this case.
Also I
> want keep the outlier in my boxplot.
> I want my boxplot look like the second one, keep the outlier, and
make an
> interrupt of y-axis from 5 to 25.
> 
> Thanks,
> Jianghong
> 
> 
> Example = c( 0.00,0.33,0.75,3.00,2.50,0.50,2.00,33.00)
> Grp_Example
=c("A","A","A","B","B","B","B","B")
> 
> Example_Data= cbind(Example,Grp_Example)
> attach(Example_Data)
> 
> 
> boxplot(Example ~ Grp_Example,main=paste("Boxplot of Example"),
> pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25))
> 
> boxplot(Example ~ Grp_Example,main=paste("Boxplot of
Example"),ylim=c(0,4),
> pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25))
Try plotting in two regions of the same device. Quick and dirty
example:

par(mfrow=c(2,1))
boxplot(Example ~ Grp_Example,main=paste("Boxplot of Example"),
pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25),
ylim=c(25,35),xaxt="n")
boxplot(Example ~ Grp_Example,
pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25),
ylim=c(0,4))

See  ?layout --instead of par(mfrow) -- and ?par for further
adjustments of region sizes and margins.

Helios

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On Mar 12, 2012, at 1:19 PM, jianghong deng wrote:
> Hello,
>
> I have created two boxplots with following R code. There is one  
> outlier in
> B group.
> The outlier is 33. But the all other data are between 0 to 4.
>
> How can I skip y-axis around 5 to 25, and expand 0-4 for this case.  
> Also I
> want keep the outlier in my boxplot.
> I want my boxplot look like the second one, keep the outlier, and  
> make an
> interrupt of y-axis from 5 to 25.
Have you looked at the interrupted axis functions, axis.break,   
gap.plot and .... wait for it ... gap.boxplot, in package plotrix?
>
> Thanks,
> Jianghong
>
>
> Example = c( 0.00,0.33,0.75,3.00,2.50,0.50,2.00,33.00)
> Grp_Example
=c("A","A","A","B","B","B","B","B")
>
> Example_Data= cbind(Example,Grp_Example)
> attach(Example_Data)
>
>
> boxplot(Example ~ Grp_Example,main=paste("Boxplot of Example"),
> pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25))
>
> boxplot(Example ~ Grp_Example,main=paste("Boxplot of  
> Example"),ylim=c(0,4),
> pars = list(boxwex = 0.25, staplewex = 0.25, outwex = 0.25))
>
> 	[[alternative HTML version deleted]]
-- 

David Winsemius, MD
West Hartford, CT