Re: [R] Scatterplot Showing All Points

From: Duncan Murdoch <>
Date: Mon, 17 Dec 2007 22:43:50 -0500

On 17/12/2007 8:14 PM, Wayne Aldo Gavioli wrote:
> Hello all,
> I'm trying to graph a scatterplot of a large (5,000 x,y coordinates) of data
> with the caveat that many of the data points overlap with each other (share the
> same x AND y coordinates). In using the usual "plot" command,

>> plot(education, xlab="etc", ylab="etc")

> it seems that the overlap of points is not shown in the graph. Namely, there
> are 5,000 points that should be plotted, as I mentioned above, but because so
> many of the points overlap with each other exactly, only about 50-60 points are
> actually plotted on the graph. Thus, there's no indication that Point A shares
> its coordinates with 200 other pieces of data and thus is very common while
> Point B doesn't share its coordinates with any other pieces of data and thus
> isn't common at all. Is there anyway to indicate the frequency of such points
> on such a graph? Should I be using a different command than "plot"?

The jitter() function can add a bit of noise to your data, so that repeated points show up as groupings instead of isolated points.

Duncan Murdoch mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Tue 18 Dec 2007 - 03:47:37 GMT

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