[R] Help with plot Grouped Bar Plot by using R

[R_beginner_starter]

Thanks a lot, Jim.
Do you mind to post out the complete content of your R script suggested?

I got add in your R code in my existing R script.
It shown the following error message:
Error in rbind(br[, 2] + 1, br[, 4]) : object 'br' not found

Thanks for your further reply.

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