R help - Mar 2006 - Misalignment of secondary axis on boxplot

Dear R-help,

I am trying to overlay a secondary y-axis over a boxplot. The problem is that
the point of the line does not correspond to the centrepoint of the boxplot,
which makes presentation and interpretation sloppy. Could someone point out
where I am going wrong please?


#DATA

f<-factor(ld$Name[ld$Order==5],levels=c("SVR","MKF","DRCH","TNC","MTN","WLB","HMB"))

g<-c(0.0213750, 0.0017000, 0.0228150, 0.0000000, 0.0787800,NA, 0.0220400,
0.0471900, 0.0060500, NA, 0.0285600, 0.0079980,
0.0000000,NA,0.0175560,0.0754110,NA, 0.0702780,NA, 0.0065875, 0.0000000, NA,
0.0000000, 0.0000000, 0.0723450, 0.0143520, 0.0000000, 0.1398600, 0.0032000,
NA,NA,0.0500850,NA, 0.0038250, 0.0000000,0.0071250, 0.0394200, 0.0000000,
0.0000000,NA,0.0000000,NA, 0.0000000, 0.0246375, NA, NA, 0.0120750,
0.0076125,NA,NA,0.0153400, 0.0077000,NA)

boxplot(g~f,ylab="",xlab="",main="")
par(new=T)
s.f<-c(0.5085714, 1.5777778, 0.6071429, 0.5233333, 0.5916667,1.1742857,
0.7987500)
plot(s.f,main="",ylab="",xlab="",type="b",axes=F,pch=19)
axis(4)

Thanks in advance,
Sion

(R 2.1.1)

--
Si?n Roberts

Department of Geography,
Queen Mary, University of London,
London,
E1 4NS.

Tel: +44 20 7882 5400
http://www.geog.qmul.ac.uk/postgraduate/student/roberts.html

s.e.roberts at qmul.ac.uk wrote:
> Dear R-help,
> 
> I am trying to overlay a secondary y-axis over a boxplot. The problem is
that
> the point of the line does not correspond to the centrepoint of the
boxplot,
> which makes presentation and interpretation sloppy. Could someone point out
> where I am going wrong please?

1. We do not have the object "ld", hence we do not see anything ...

2. I guess you do not want to call lines() rather than plot() when 
adding elements to the boxplot ....

Uwe Ligges


> 
> #DATA
> 
>
f<-factor(ld$Name[ld$Order==5],levels=c("SVR","MKF","DRCH","TNC","MTN","WLB","HMB"))
> 
> g<-c(0.0213750, 0.0017000, 0.0228150, 0.0000000, 0.0787800,NA,
0.0220400,
> 0.0471900, 0.0060500, NA, 0.0285600, 0.0079980,
> 0.0000000,NA,0.0175560,0.0754110,NA, 0.0702780,NA, 0.0065875, 0.0000000,
NA,
> 0.0000000, 0.0000000, 0.0723450, 0.0143520, 0.0000000, 0.1398600,
0.0032000,
> NA,NA,0.0500850,NA, 0.0038250, 0.0000000,0.0071250, 0.0394200, 0.0000000,
> 0.0000000,NA,0.0000000,NA, 0.0000000, 0.0246375, NA, NA, 0.0120750,
> 0.0076125,NA,NA,0.0153400, 0.0077000,NA)
> 
> boxplot(g~f,ylab="",xlab="",main="")
> par(new=T)
> s.f<-c(0.5085714, 1.5777778, 0.6071429, 0.5233333, 0.5916667,1.1742857,
> 0.7987500)
>
plot(s.f,main="",ylab="",xlab="",type="b",axes=F,pch=19)
> axis(4)
> 
> Thanks in advance,
> Sion
> 
> (R 2.1.1)
> 
> --
> Si?n Roberts
> 
> Department of Geography,
> Queen Mary, University of London,
> London,
> E1 4NS.
> 
> Tel: +44 20 7882 5400
> http://www.geog.qmul.ac.uk/postgraduate/student/roberts.html
> 
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