Position geom_text on dodged barplot

I tried to make the title self-explanatory, but here goes - data first:

dtf <- structure(list(variable = structure(c(1L, 1L, 2L, 2L, 3L, 3L,
4L, 4L, 5L, 5L), .Label = c("vma", "vla", "ia", "fma", "fla"), class = "factor"),
ustanova = structure(c(1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L,
2L), .Label = c("srednja škola", "fakultet"), class = "factor"),
`(all)` = c(42.9542857142857, 38.7803203661327, 37.8996138996139,
33.7672811059908, 29.591439688716, 26.1890660592255, 27.9557692307692,
23.9426605504587, 33.2200772200772, 26.9493087557604)), .Names = c("variable",
"ustanova", "(all)"), row.names = c(NA, 10L), class = c("cast_df",
"data.frame"), idvars = c("variable", "ustanova"), rdimnames = list(
structure(list(variable = structure(c(1L, 1L, 2L, 2L, 3L,
3L, 4L, 4L, 5L, 5L), .Label = c("vma", "vla", "ia", "fma",
"fla"), class = "factor"), ustanova = structure(c(1L, 2L,
1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L), .Label = c("srednja škola",
"fakultet"), class = "factor")), .Names = c("variable", "ustanova"
), row.names = c("vma_srednja škola", "vma_fakultet", "vla_srednja škola",
"vla_fakultet", "ia_srednja škola", "ia_fakultet", "fma_srednja škola",
"fma_fakultet", "fla_srednja škola", "fla_fakultet"), class = "data.frame"),
structure(list(value = structure(1L, .Label = "(all)", class = "factor")), .Names = "value", row.names = "(all)", class = "data.frame")))

And I'd like to create a dodged barplot, do the coord_flip and put some text labels inside the bars:

ggplot(bar) + geom_bar(aes(variable, `(all)`, fill = ustanova), position = "dodge") +
geom_text(aes(variable, `(all)`, label = sprintf("%2.1f", `(all)`)), position = "dodge") +
coord_flip()

you can see output here.

enter image description here

I reckon I'm asking for something trivial. I want the text labels to "follow" stacked bars. Labels are placed correctly on the y-axis, but how to position them correctly on x-axis?

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最佳答案

Is this what you want?

library(ggplot2)


ggplot(bar) +
geom_col(aes(variable, `(all)`, fill = ustanova), position = "dodge") +
geom_text(aes(variable, `(all)`, label = sprintf("%2.1f", `(all)`), group = ustanova),
position = position_dodge(width = .9)) +
coord_flip()

The key is to position = position_dodge(width = .9) (where .9 is the default width of the bars) instead of position = "dodge", which is just a shortcut without any parameter. Additionally you have to set the group=ustanova aesthetic in geom_text to dodge the labels by ustanova (A second option would be to make fill = ustanova a global aesthetic via ggplot(bar, aes(fill = ustanova))

In ggplot2_2.0.0 you find several examples in ?geom_text on how to position geom_text on dodged or stacked bars (the code chunk named "# Aligning labels and bars"). The Q&A What is the width argument in position_dodge? provides a more thorough description of the topic.