Hi,
Can anyone help with plotting vertical error bars on a bar graph.
I have tried following examples online and in the big R book and writing my own
function but I have been unsuccessful and donât really have an understanding
of what it is I am doing. I have calculated my standard errors so basically
just need to draw the bars on the graph but just donât have a clue!!!
I donât even know what information people will need to help me......
The code for my graph is:
barplot(tapply(Sporangia,list(Host,Isolate),mean),xlab="Isolate",ylab="Mean
Sporangia per Needle",col=c("grey39","grey64","grey89"),beside=T)
col=c("grey39","grey64","grey89")
legend("topright",inset=.05,title="Host",c("European Larch","Hybrid
Larch","Japanese Larch"),fill=col,horiz=FALSE)
Any help would be greatly appreciated,
Anna
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