[R] ggplot2: Adding points to a density plot

[Johannes Graumann]

Thanks a lot! This got me started!

Joh

Dennis Murphy wrote:

> Hi:
> 
> Try this:
> 
> library(ggplot2)
> movmed <- ddply(movies, .(decade), summarise, med = median(rating))
> m + geom_point(data = movmed, aes(x = med), y = 0, size = 2)
> 
> HTH,
> Dennis
> 
> On Wed, Mar 31, 2010 at 4:46 AM, Johannes Graumann
> <johannes_graumann at web.de
>> wrote:
> 
>> Hi,
>>
>> Consider something like
>> > library(ggplot2)
>> > movies$decade <- round_any(movies$year, 10)
>> > m <- qplot(rating,data=movies,colour=factor(decade),geom="density")
>> > m
>> (modified from "?stat_density").
>>
>> I'd like to add on the line y=0 a dot for the median of each "decade"
>> category (using the same colour coding as the "fill"). I'm failing
>> miserably
>> at all my
>> > m + geom_point
>> based approaches and would appreciate if someone could show me the
>> ggplot2 way of achieving this.
>>
>> Thanks, Joh
>>
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>>
> 
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