FWIW James said it in the 2003 edition of his historical baseball abstract -- fairly deep into his career -- his explanations aren't always complete so I doubt it is based on that one metric alone that just happens to be the one he mentioned.
__________________
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
He is available to do custom drawings in graphite, charcoal and other media. He also sells some of his works as note cards/greeting cards on Etsy under JamesSpaethArt.
|