CODEWITHSUNDEEP
rplotggplot2
chamaoskurumi
chamaoskurumi

Reputation: 2493

Only one observation but 2 points in ggplot2 qplot?

I would like to visualize publication dates by academic discipline in a ggplot2 qplot. data$DISCIPLINE is my factor containing 10 levels.

This is how my data looks like:

> head(cbind(data$DATE,data$DISCIPLINE))
     [,1]   [,2]                   
[1,] "2001" "Politikwissenschaften"
[2,] "2006" "Geographie"           
[3,] "1999" "Soziologie"           
[4,] "2013" "Architektur"          
[5,] "2007" "Soziologie"           
[6,] "2004" "Soziologie"

I produced the qplot as follows:

require(ggplot2)
MYPLOT <- qplot(data$DATE, data$DISCIPLINE)
MYPLOT + geom_point(aes(size=..count..), stat="bin") + scale_size(range=c(0, 15))

plot

Of course I want bins with 0 observations not to be plotted - this is why I set the range minimum to 0. At least, that worked.

However strangely, single observations received two points in the plot. See for example for the level "Soziologie", there are 2 points in the plot in the early 80s, despite there only being a single observations in my dataset.

Is this an error in ggplot2? How can I correct it?

Upvotes: 1

Views: 202

Answers (1)

matt_k
matt_k

Reputation: 4459

Does this do what you want?

MYPLOT <- qplot(data$DATE, data$DISCIPLINE)
MYPLOT + geom_point() + stat_sum(aes(size = ..n..))

Upvotes: 2

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