How to put labels over geom bar in R with ggplot2

Question

I d like to have some labels stacked on top of a geom bar graph  Here s an example   df  lt - data frame x factor c TRUE TRUE TRUE TRUE TRUE FALSE FALSE FALSE    ggplot df    geom bar aes x fill x     opts axis text x theme blank   axis ticks theme blank   axis title x theme blank   legend title theme blank   axis title y theme blank        Now      table df x    FALSE  TRUE      3     5    I d like to have the 3 and 5 on top of the two bars  Even better if I could have the percent values as well  E g  3  37 5   and 5  62 5    Like so    source  skitch com     Is this possible  If so  how

User · Answer

To plot text on a ggplot you use the geom text   But I find it helpful to summarise the data first using ddply  dfl  lt - ddply df    x   summarize  y length x   str dfl    Since the data is pre-summarized  you need to remember to change add the stat  identity  parameter to geom bar   ggplot dfl  aes x  y y  fill x     geom bar stat  identity         geom text aes label y   vjust 0        opts axis text x theme blank            axis ticks theme blank            axis title x theme blank            legend title theme blank            axis title y theme blank

User · Answer

As with many tasks in ggplot  the general strategy is to put what you d like to add to the plot into a data frame in a way such that the variables match up with the variables and aesthetics in your plot  So for example  you d create a new data frame like this   dfTab  lt - as data frame table df   colnames dfTab  1   lt -  x  dfTab lab  lt - as character 100   dfTab Freq   sum dfTab Freq     So that the x variable matches the corresponding variable in df  and so on  Then you simply include it using geom text   ggplot df    geom bar aes x fill x          geom text data dfTab aes x x y Freq label lab  vjust 0        opts axis text x theme blank   axis ticks theme blank            axis title x theme blank   legend title theme blank            axis title y theme blank      This example will plot just the percentages  but you can paste together the counts as well via something like this   dfTab lab  lt - paste dfTab Freq paste     dfTab lab      sep     sep        Note that in the current version of ggplot2  opts is deprecated  so we would use theme and element blank now

User · Answer

Another solution is to use stat count   when dealing with discrete variables  and stat bin   with continuous ones   ggplot data   df  aes x   x     geom bar stat    quot count quot      stat count geom    quot text quot   colour    quot white quot   size   3 5  aes label     count    position position stack vjust 0 5

[r] How to put labels over geom_bar in R with ggplot2

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