ggplot2错误条在条上的位置错误

Question

I've a problem. I use for my error bars the standard error (se). My error bars are far above my bars and I've tried already placing the ymin and ymax in ggplot itself, but with no effect.

My data frame looks like the following:

  ID variable        se
1 A  14.340695 0.7917790
2 B  32.506312 0.9092173
3 C  7.279953 0.0444325

And I used the following code:

df$variable=as.numeric(as.character(df$variable))
limits<-aes(ymin=df$variable - df$se, ymax=df$variable + df$se)
r<-ggplot(df, aes(x=ID, y=factor(variable), fill=variable)) 
r + geom_bar(position=position_dodge(), stat="identity") + geom_errorbar(limits)

I don't know why the position of the error_bars ends up so much higher than the bars itself.

I would appriciate your help, many thanks!

Answer 1

It seems to be something with setting y as factor. If you remove it, it works:

ggplot(df, aes(x=ID, y=variable, fill=variable)) + 
  geom_bar(stat="identity") +
  geom_errorbar(aes(ymin=variable-se, ymax=variable+se))