Alan Haynes shows how to build flow charts in R using the grid Gmisc packages:
Flow charts are an important part of a clinical trial report. Making them can be a pain though. One good way to do it seems to be with the grid and Gmisc packages in R. X and Y coordinates can be designated based on the center of the boxes in normalized device coordinates (proportions of the device space – 0.5 is this middle) which saves a lot of messing around with corners of boxes and arrows.
A very basic flow chart, based very roughly on the CONSORT version, can be generated as follows…
Click through for sample code and a resulting image. H/T R-bloggers