Overall correlation in ggpairs with colour grouping?

Question

This code produces a nice pairs plot that has a correlation read-out on the middle right:

library(GGally)
ggpairs(esoph[,c(1,4,5)], colour='agegp')

You can get just the correlation square with:

ggally_cor(data=esoph[,c(1,4,5)],
           mapping=aes(x=ncases, y=ncontrols, colour='agegp'))

The square contains a correlation per group. Is there any way to get the correlation for the over-all data set to appear as well? If you don't use colour=... then you get it, but then you don't get the per-group correlations.

Answer 1

I can now verify that this works with GGally_0.4.4 with R version 3.0.1 (2013-05-16) on Platform: x86_64-pc-linux-gnu (64-bit)

library(GGally)
ggally_cor(data=esoph[,c(1,4,5)],
       mapping=aes(x=ncases, y=ncontrols, colour='agegp'))

See that the overall correllation appears at the top and is consistent with the number I get from this command:

ggally_cor(data=esoph[,c(1,4,5)],
       mapping=aes(x=ncases, y=ncontrols))