I would like to use the ggplots2 package to a dot plot and plot some phenotype data vs. the latitude coordination (it's the place the where the sample was collected). The dots should be dependent of the size of the phenotype. And there's the problem I failed so far: I have for the phenotype negative and positive values. Do you know if there is a possibility to plot these data where for example -10 and +10 have them same size and values in between have an intermediate sizes?
Thanks a lot for your ideas.