R help - Oct 2012 - how to add mean value to regression line using ggplot?

I have generated plot using ggplot, and i would like to add mean value to the
regression line as a marker. how to do it?

p <- ggplot(data, aes(x = x, y = y, 
                          color = a, shape = factor(sex), 
                          linetype = factor(sex))) 

p0 <- p + 
  scale_color_manual(values=c("#00FFFF", "#FFFF00",
"#00FF00")) +
  geom_smooth(method = "lm", se = FALSE, size = 1.5) 

Thanks a lot.



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