How to stack error bars in a stacked bar plot using geom_errorbar?

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What is happening here is that ggplot is not stacking the error bars (they would have to be summed) so you will have to do that by hand (and it seems that Hadley thinks that this is not a good idea and wil not add this functionality).

So doing by hand:

DF$ci_l[DF$response == "Yes, part of the journey"] <- with(DF,ci_l[response == "Yes, part of the journey"] +
         ci_l[response == "Yes, entire the journey"])

DF$ci_u[DF$response == "Yes, part of the journey"] <- with(DF,ci_u[response == "Yes, part of the journey"] +
                                                             ci_u[response == "Yes, entire the journey"])

Now:

ggplot(DF, aes(x=factor(year), y=proportion)) +
  facet_grid(. ~ sex) +
  geom_bar(stat="identity",aes(fill=response)) +
  geom_errorbar(aes(ymin= ci_l, 
                    ymax= ci_u),
                width=.2,                    # Width of the error bars
                position="identity")

enter image description here

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