match jitter from points and error bars

[mrwawa]

Can anyone recommend how to match the jitter from points and error
bars? I have a data set with categories on the x axis and continuous
variables on the Y axis. Estimates are plotted as points with error
bars. To avoid overlap, I want to jitter the points, but can't get the
jittered points and error bars to match up.

Any help would be appreciated.

Wade

[Winston Chang]

Instead of using separate points and error bars, check out geom_pointrange -- it's a single geom with a point and lines, so jittering should move both together.

http://had.co.nz/ggplot2/geom_pointrange.html

Another option is to jitter the data yourself, by using runif() to add small random values to the x (or y) coordinate.

-Winston

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[mrwawa]

That was exactly what I was looking for. Thanks.

On Jan 25, 5:29 pm, Winston Chang <winstoncha...@gmail.com> wrote:
> Instead of using separate points and error bars, check out geom_pointrange
> -- it's a single geom with a point and lines, so jittering should move both

> together.http://had.co.nz/ggplot2/geom_pointrange.html

[Scott Jackson]

could you just jitter your x?

ggplot(your.data, aes(jitter(x), y)) + geom_point() +
geom_errorbar(aes(ymin = your.ymin.var, ymax = your.ymax.var))

-scott

[Jean-Olivier Irisson]

On 2012-Jan-26, at 00:29 , Winston Chang wrote:
>
> Another option is to jitter the data yourself, by using runif() to add small random values to the x (or y) coordinate.

Or use the jitter() function directly.

But are you sure jittering is the best solution for you? If you jitter points and bars and want lines connecting the points in the different levels of the factor, the graph will quickly become unreadable. Is it something like this:
http://dl.dropbox.com/u/1047321/ggplot/fig-description_by_scale.pdf
that you are trying to achieve? If yes, I would advise you to use a fixed offset per factor level (as I did: green always on the left, red always on the right) rather than jittering. I tried jittering and it was messy. Or best, if you can afford the extra space, use facets, it will be clearer.

Jean-Olivier Irisson
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