Categorical bubble plot

Jurgens de Bruin <debruinjj <at> gmail.com> writes:

Hi,

I do not have much R experience just the basics, so please excuse
any obvious questions.

I would like to create bubble plot that have Categorical data on the x and y
axis and then the diameter if the bubble the value related to x and y.
 Attached to the email is a pic of what I would like to do.

A reproducible example would be great.

something along the lines of

library(ggplot2)
ggplot(mydata,aes(x=drugclass,y=plant,colour=fitvalue,size=?))+geom_point()

  it's not clear from your description what determines the size.
  From a labeling point of view, switching x and y might be useful.