[R] How do I do a pretty scatter plot using ggplot2?

R. Michael Weylandt michael.weylandt at gmail.com
Sat Mar 10 02:07:19 CET 2012

That doesn't really seem to make sense to me as a graphical
representation (transforming adjacent y values differently), but if
you really want to do so, here's what I'd do if I understand your goal
(the preprocessing is independent of the graphics engine):

DAT <- data.frame(x = runif(1000, 0, 20), y = rcauchy(1000)^2) # Nice
and volatile!

# split y based on some x binning and assign empirical quantiles of each group

DAT$yquant <- with(DAT, ave(y, cut(x, seq(0, 20, 5)), FUN =
function(x) ecdf(x)(x)))

plot(yquant ~ x, data = DAT)

 # ggplot2

p <- ggplot(DAT, aes(x = x, y = yquant)) + geom_point()

Michael Weylandt

PS -- I see Josh Wiley just responded pointing out your requirements
#1 and #2 are incompatible: I've used 1 here.

On Fri, Mar 9, 2012 at 7:37 PM, Michael <comtech.usa at gmail.com> wrote:
> Hi all,
> I am trying hard to do the following and have already spent a few hours in
> vain:
> I wanted to do the scatter plot.
> But given the high dispersion on those dots, I would like to bin the x-axis
> and then for each bin of the x-axis, plot the quantiles of the y-values of
> the data points in each bin:
> 1. Uniform bin size on the x-axis;
> 2. Equal number of observations in each bin;
> How to do that in R? I guess for the sake of prettyness, I'd better do it
> in ggplot2?
> Thank you!
>        [[alternative HTML version deleted]]
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