Center error bars (geom_errorbar) horizontally on bars (geom_bar)

Question

How would I position the error bars in the centre of the appropriately coloured bars?

df1 <- data.frame(
  supp = c(\"OJ\",\"OJ\",\"OJ\",\"VC\",\"VC\",\"V         


        

Answer 1

As data for error bars are located in the same data frame where data for the bars you don't need to provide argument data= in geom_errorbar() and also there is no need to call geom_errorbar() twice.

You should provide in geom_errorbar() ymin and ymax values in aes(), also color=supp in aes() will ensure that error bars are colored according to supp values. To get the same colors as for bars, add scale_color_manual() with the same color names. With argument position=position_dodge(0.9) you can get errorbars in center of bars.

ggplot(df1, aes(x=dose, y=len, fill=supp)) +      
  geom_bar(stat="identity", position=position_dodge()) +  
  scale_fill_manual(name = "", values = c("deepskyblue1", "green")) +
  geom_errorbar(aes(ymin=len-se, ymax=len+se,color=supp), width=.4,
       position=position_dodge(.9))+
  scale_color_manual(name = "", values = c("deepskyblue1", "green"))