Although the analysis is complicated, the lessons it teaches us are straightforward. Streaky seasons undoubtedly exist, but it appears that there is no such thing as a streaky or unstreaky player. Rather, the truth seems to be that all players are streaky players. Being human, they have their ups and downs, and they are inherently streakier than random chance would dictate. They are not dice, and they are not random number generators. If Murray Chass ever read Fangraphs, I’m sure he’d be thrilled to hear that. But, again, there is no evidence whatsoever to suggest that a player who is especially streaky in one season will continue to be so in the next.
– Seth Samuels, Fangraphs.com.
The conclusion of Seth’s research I’ve mentioned here several times. Read the whole thing because the analysis is interesting and the scatterplot is money.