Using the Stuff Metric as an Injury Identification Tool
Introduction
Before I came to Rotographs – I wrote a lot on my own site, and in the FanGraphs community section. My first foray into baseball analysis was developing a metric to try and quantify “Stuff”. A New York Times article by John Branch in October 2015 discussed the elusive definition of the pitching term “stuff”. Talk of “plus stuff” and feelings of “all the stuff being there” was scattered throughout the article.
Despite interesting commentary discussing the ability for pitchers to over-power hitters, there was no true definition of the nastiness of a pitcher’s stuff. My favourite quote from the article is that stuff is “both meaningful and meaningless. There are no synonyms. Like pornography, stuff is defined mostly by example. An only pitchers have stuff. Hitters do not have stuff (Branch, 2015)”.
