September 3, 2005
We're waiting for Beautiful Evidence by Edward Tufte, apparently still in the wings. This, via Newmark's Door, is a lagniappe demonstrating that evidence must be interpreted and is about comparisons.
One day when I was a junior medical student, a very important Boston
surgeon visited the school and delivered a great treatise on a large
number of patients who had undergone successful operations for vascular
reconstruction. At the end of the lecture, a young student at the back
of the room timidly asked, "Do you have any controls?" Well, the great
surgeon drew himself up to his full height, hit the desk, and said, "Do
you mean did I not operate on half of the patients?" The hall grew very
quiet then. The voice at the back of the room very hesitantly replied,
"Yes, that's what I had in mind." Then the visitor's fist really came
down as he thundered, "Of course not. That would have doomed half of
them to their deaths." God, it was quiet then, and one could scarcely
hear the small voice ask, "Which half?"