[R] How to plot doubles series with different location using plotCI

[Jose Iparraguirre]

Hi Rosalinde,

If you set the argument err equal to "x", you'll get horizontal error bars.
Hope this helps,
José


José Iparraguirre
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of linde
Sent: 11 February 2013 09:02
To: r-help at r-project.org
Subject: [R] How to plot doubles series with different location using plotCI



Dear list
members,

I would
like to create two series of plotted mean values and error bars, yet with different locations along the x-axis. 
Plotting of
first series using plotCI with the standard arguments goes without any problem.
However I do not succeed to add the second series in the same plot, which should be horizontally shifted from the first series along the x-axis. The “add=TRUE�
argument works well. Is there any argument defining the series location within plotCI. For example the tool “boxplot� contains the “at� argument. I found examples of plotCI where a vertical shift is realized (e.g.  “x=means+1e5�), never a horizontal shift. 

Here
you find data information:

##data
value1<-c(1,2,1,2,1,3,4,2,6,1,3,4,2,6)
value2<-c(1,5,1,2,4,4,4,3,3,1,3,4,9,8)
typo<-c("C","C","C","C","A","A","A","A","A","B","B","B","B","B")
tab1<-data.frame(data=cbind(value1,value2,typo))
colnames(tab1)<-c("value1","value2","typo")
Â
tab1$value1<-as.numeric(tab1$value1)
tab1$value2<-as.numeric(tab1$value2)

##mean and error first data series 

tmp <-
split(tab1$value1,tab1$typo)
means <-
sapply(tmp, mean)
stdev <-
sapply(tmp, sd)
n <-
sapply(tmp,length)
ciw <-
qt(0.975, n) * stdev / sqrt(n)

##plotting
first data series
plotCI(x=means,uiw=stdev,
col="red", barcol="red", lwd=3, pch=18,
cex=2,
xaxt="n", yaxt="n",  ylab='benefit',xlab='typo', yaxs = 'i',ylim=c(0,8)) axis(side=1, at=1:3, labels=names(tmp), cex=0.7)  

##mean and error second data series 

tmp <-
split(tab1$value2,tab1$typo)
means <-
sapply(tmp, mean)
stdev <-
sapply(tmp, sd)
n <-
sapply(tmp,length)
ciw <-
qt(0.975, n) * stdev / sqrt(n)

##the
problem: plotting second dataseries
plotCI(x=means,
uiw=stdev, col="steelblue", barcol="steelblue", lwd=2, pch=18, cex=2, xaxt="n", yaxt="n", ylab='qualite',xlab='type', yaxs = 'i',add=T)Â  ##this series of data is now superposed, but would like to put them horizontally shifted next to the red values

Thanks in
advance,

Rosalinde Van Couwenberghe

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