I mused over Test Driven Analysis on this blog before, but it was Richard Pugh’s talk on SAS to R Migration at LondonR last week that brought the topic back into my mind and clarified a few things.
Rich’s presentation focused on the challenge of how to ensure that the new system (R) would provide the same answers as the legacy system (SAS).
This is when it clicked with me: My brain is just another system as well.