creating tree diagram for showing case count using R

Question

I need to create a "tree diagram"-like graph to present the number of cases for different scenarios, like the one shown below:

The picture is quoted from :

Pediatrics. 2005 Dec;116(6):1317-22.
Electronic surveillance system for monitoring surgical antimicrobial prophylaxis.
Voit SB, Todd JK, Nelson B, Nyquist AC.

I can get the numbers easily from R using the table command, but it is not a very good way to present it.

The chart can be made without any fancy colors or stuff, I just want to use the format to present the numbers. Any suggestions?

Answer 1

The tree diagram could be drawn using the "diagram" package. It is a generic package for drawing flow diagrams etc. See

library(diagram)
demo("flowchart")