Overlaying scatter plot and mean plot

[Troy S]

Hi,

I have a basic mean and sd plot.

dfsumm <- data.frame(x=1:3, mean=c(4,5,7), sd=c(1,1,2))
ggplot(dfsumm, aes(x, mean))+
geom_errorbar(aes(ymin=mean-sd, ymax=mean+sd))+geom_point()

How do I overlay a jittered scattered plot using a 2nd color?

Example data frame:
df <- data.frame(t=c(1,1,1,2,2,2,3,3,3), val=c(3.9,4,4.1,4.9,5,5.1,6.9,7,7.1))

Troy

[Erik Iverson]

Try adding the following to your plot:

geom_jitter(aes(t, val), data = df, colour = I("red"))

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[Troy S]

Thanks all for the ideas.  I was so close..........

On 16 December 2010 14:57, Dennis Murphy <djm...@gmail.com> wrote:

Hi:

In addition to Erik's answer, I prefer to rein in the jittering, something like the following:

# Your original code:

dfsumm <- data.frame(x=1:3, mean=c(4,5,7), sd=c(1,1,2))
ggplot(dfsumm, aes(x, mean))+

 geom_errorbar(aes(ymin=mean-sd, ymax=mean+sd), width = 0.5)+geom_point()

# I tightened the width of the error bars in the previous line.
# Generated more data to illustrate my point about tightening the jitter...
df <- data.frame(tt = rep(1:3, each = 40),
           val = round(rnorm(120, m = rep(c(4, 5, 7), each = 40))))

ggplot(dfsumm, aes(x, mean))+

 geom_errorbar(aes(ymin=mean-sd, ymax=mean+sd), width = 0.5, size = 1) +
 geom_point(size = 3) +
 geom_jitter(aes(tt, val), data = df, colour = I("red"),
                   position = position_jitter(width = 0.05))

I added the position argument to Erik's geom_jitter() suggestion to exert control over the extent of the jittering and played around with other arguments such as thickness of the error bars (size = 1) and size of the center points (size = 3 in geom_point()). This should give you some ideas how to customize your plot.

HTH,
Dennis

[Adam_L...@keybank.com]

Use stat_summary to calculate the mean and sd from the data - if you do this, then plotting the data itself will be just a matter of adding geom_jitter().

It'd be even easier to just use geom_boxplot along with geom_jitter().


Adam Loveland
216-689-5409
1Key

Troy S <troysoc...@yahoo.com> Sent by: ggp...@googlegroups.com 12/16/2010 02:23 PM

To ggplot2 <ggp...@googlegroups.com> cc Subject Overlaying scatter plot and mean plot

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[Adam_L...@keybank.com]

Ah, so you need the, "data=" if you're resetting the dataset. I kept getting an error when I simply included the name of the new dataset. Wow.




Adam Loveland
216-689-5409
1Key

Erik Iverson <er...@ccbr.umn.edu> Sent by: ggp...@googlegroups.com 12/16/2010 03:02 PM

To Troy S <troysoc...@yahoo.com> cc ggplot2 <ggp...@googlegroups.com> Subject Re: Overlaying scatter plot and mean plot