ggplot2 Scatter Plot Labels

Question

I'm trying to use ggplot2 to create and label a scatterplot. The variables that I am plotting are both scaled such that the horizontal and the vertical axis are plotted in units of standard deviation (1,2,3,4,...ect from the mean). What I would like to be able to do is label ONLY those elements that are beyond a certain limit of standard deviations from the mean. Ideally, this labeling would be based off of another column of data.

Is there a way to do this?

I've looked through the online manual, but I haven't been able to find anything about defining labels for plotted data.

Help is appreciated!

Thanks!

BEB

hadley · Accepted Answer · 2009-11-29 22:45:55Z

17

Use subsetting:

library(ggplot2)
x <- data.frame(a=1:10, b=rnorm(10))
x$lab <- letters[1:10]
ggplot(data=x, aes(a, b, label=lab)) + 
  geom_point() + 
  geom_text(data = subset(x, abs(b) > 0.2), vjust=0)

answered Nov 29, 2009 at 22:45

hadley

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rcs · Accepted Answer · 2009-11-29 22:22:35Z

4

The labeling can be done in the following way:

library("ggplot2")
x <- data.frame(a=1:10, b=rnorm(10))
x$lab <- rep("", 10)   # create empty labels
x$lab[c(1,3,4,5)] <- LETTERS[1:4]   # some labels
ggplot(data=x, aes(x=a, y=b, label=lab)) + geom_point() + geom_text(vjust=0)

answered Nov 29, 2009 at 22:22

rcs

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Comments

Brandon Bertelsen · Accepted Answer · 2015-03-27 10:20:25Z

1

Subsetting outside of the ggplot function:

library(ggplot2)
set.seed(1)
x <- data.frame(a = 1:10, b = rnorm(10))
x$lab <- letters[1:10]
x$lab[!(abs(x$b) > 0.5)] <- NA
ggplot(data = x, aes(a, b, label = lab)) + 
  geom_point() + 
  geom_text(vjust = 0)

Using qplot:

qplot(a, b, data = x, label = lab, geom = c('point','text'))

edited Mar 27, 2015 at 10:20

Brandon Bertelsen

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answered Mar 25, 2015 at 13:08

mpalanco

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