This is a question better geared for my RotoAuthority blog, but I figured I’d throw it out here. I feel ashamed for having to ask this, since I completed at least a couple of statistics classes in college. Oh well.
The question: what’s a valid sample size for us to use to judge a baseball player’s season? Let’s assume 550 ABs for a hitter and 200 innings for a pitcher. When do the 2007 numbers start to become predictive of the player’s entire season? 200 ABs, 75 innings? Beats me.
I am so far removed from "real" stats that I don’t know where to begin. Anybody out there know how to mathematically decide to cut bait on a player? Give your thoughts in the comments, or else email me at firstname.lastname@example.org.