r - ggplot2 show separate mean values in box plot for grouped data -

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i create box plot grouped data shows mean of each group point in box. using following code, single point 2 groups.

df <- data.frame(a=factor(rbinom(100, 1, 0.45), label=c("m","w")),      b=factor(rbinom(100, 1, 0.3), label=c("young","old")),     c=rnorm(100)) ggplot(aes(y = c, x = b, fill = a), data = df) +      geom_boxplot() +     stat_summary(fun.y="mean", geom="point", shape=21, size=5, fill="white")

enter image description here

part of problem changing fill of point, since fill property determines 2 box plots of different color should drawn, point behaves if there 1 group again. think should give want.

ggplot(df, aes(x=b, y=c, fill=a)) +   geom_boxplot() +   stat_summary(fun.y="mean", geom="point", size=5,     position=position_dodge(width=0.75), color="white")

box plot mean


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