[R] Error.bars

[Frank E Harrell Jr]

Sueli Rodrigues wrote:
> Hi,
> I'm studying the Michael J. Crawley book (Statistics An Introduction using
> R)and I'm trying to reproduce one example (page 168) for plot a barplot
> with error bars, but when I put the function I receive the following
> message. Please, could someone told me what's wrong?
> 
> error.bars=function(yv,z,nn){xv=barplot(yv,ylim=c(0,(max(yv)+max(z))),names=nn,ylab=deparse(substitute(yv)))g=(max(xv)-min(xv))/50
> for(i in
> 1:length(xv)){lines(c(xv[i],xv[i]),c(yv[i]+z[i],yv[i]-z[i]))lines(c(xv[i]-g,xv[i]+g),c(yv[i]+z[i],yv[i]+z[i]))lines(c(xv[i]-g,xv[i]+g),c(yv[i]-z[i],yv[i]-z[i]))}}
> 
> Erro: unexpected symbol in
> "error.bars=function(yv,z,nn){xv=barplot(yv,ylim=c(0,(max(yv)+max(z))),names=nn,ylab=deparse(substitute(yv)))g"
> 
> 
> Sueli Rodrigues
> 
> Eng. Agrônoma - UNESP
> Mestranda - USP/ESALQ
> PPG-Solos e Nutrição de Plantas
> Fones (19)93442981
>       (19)33719762
>

This is the notorious "dynamite plot" which causes distorted
perceptions, has an arbitrary base, and other problems.  See 
http://biostat.mc.vanderbilt.edu/DynamitePlots for more
information.

Frank
-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University