[R] Median line with stripchart

[Luigi]

Sorry for the inconvenience,
I have added an EXAMPLE. Here I am plotting few data with the relative
median values. The median are added ad hoc using the points() function,
which is not really professional and is time consuming. With boxplot() the
median values are automatically drawn, with striplot() this is not true and
I couldn't find another suitable package.
Note: usually I work with data frames and the group names is plotted
correctly; here I have added the group names with text().

Thank you,
Regards,
Luigi

########### THE EXAMPLE
############################################################################
#############
# assigning data
Control<-c(0.002325138,	0.002460417, 0.010971385, 0.033016026, 0.035646472,
3.161701212, 5.10096383, 5.327863403)
Case<-c(0.000142311, 0.010751273, 0.151395382, 0.153094117, 0.381564497,
1.32567787, 2.915908912, 14.2888441)
my.data<-cbind(Control, Case)
Med.Control<-0.034331249
Med.Case<-0.267329307


# plotting data
stripchart(Control, method = "stack" , offset=1/3, vertical = TRUE, pch=19,
at=0.5) 
stripchart(Case, method = "stack" , offset=1/3, vertical = TRUE, pch=19,
at=1.5,add=TRUE)

# adding text
text(0.7, 0, labels = "Controls")
text(1.7, 0, labels = "Cases")
		
# adding median values 	
points(0.5, Med.Control, pch="-", cex=3, col="red")	
points(1.5, Med.Case, pch="-", cex=3, col="red")	

############################################################################
#####################################


-----Original Message-----
From: David L Carlson [mailto:dcarlson at tamu.edu] 
Sent: 13 June 2012 17:29
To: 'Luigi'; r-help at r-project.org
Subject: RE: [R] Median line with stripchart

It would help if you would give us a copy of at least part of the data you
are using and show us what you have tried so far. This is a simple example.
In this case the median is for the entire data set not for a single group.
But you really didn't give us enough information. 

x <- rnorm(75)
g <- rep(1:3, 25)
stripchart(x~g)
abline(v=median(x), lty=2)

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Luigi
> Sent: Wednesday, June 13, 2012 10:57 AM
> To: r-help at r-project.org
> Subject: [R] Median line with stripchart
> 
> Dear all,
> 
> I would like to ask if it possible to draw a median line in a
> Stripchart,
> either using the built-in STRIPCHART function or with another package.
> 
> I was expecting stripchart() to work more or less like boxplot(), but I
> couldn't find an easy way to draw a mean or median line, neither I
> found
> this option in other packages.
> 
> Could somebody help?
> 
> Best regards,
> 
> 
> 
> Luigi Marongiu, MSc
> 
> 
> 
> 
> 	[[alternative HTML version deleted]]
> 
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