r - ggplot2 graph and overriding -

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i have started using ggplot2 so, once again apologize posting basic question.

i read code in 1 of pages. code nicely plots line graph , average red dot: 

ggplot(mpg, aes(trans, cty)) +   geom_point() +   stat_summary(geom = "point", fun.y = "mean", colour = "red", size = 4)

i thought of simplifying bit overriding contents of geom_point() , using stat="summary"

ggplot(mpg, aes(trans, cty)) +   geom_point(stat = "summary", fun.y = "mean", colour = "red", size = 4) +

however, above code doesn't work. can please me why above code doesn't work? specifically, plots red dot (mean point). don't see scatterplot although have used geom_point()

because ggplot() defines aes(), overriding them using geom layer.

in first case, geom_point() completes plotting of points, , stat_summary() did part of adding summary statistics layer graph.

but, when define stat = "summary", tell geom_point() plot summary statistics instead of data points.

head on ggplot2 documentation , read how mapping works within ecosystem: http://docs.ggplot2.org/current/


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