Uncertainty, Mookie Betts, and Javier Baez
A number of people who are actually good at math have asked before why we don’t present measures of uncertainty, like error bars, when talking about WAR or projections. I’m not in charge of those things, myself, so I can’t give you the official answer, but, they’re difficult numbers to calculate, if they’re possible at all, and many people wouldn’t know how to understand them, and it’s unclear how much those measures would add to the picture anyway. Sometimes you’ll see projections presented in percentiles, like PECOTA, but generally speaking the percentiles can include almost any and all outcomes, so that doesn’t help much. There’s interest in seeing uncertainty, quantitated. It’s challenging, to do it in a meaningful way.
But I want to try something, again with your help. Last week, I ran a bunch of polls, and a few days ago I analyzed the information generated. Here I’d like to take a similar approach. Now, the post was inspired by the transcript of Dave’s Wednesday chat:
12:40
Comment From Curtis
Of all the prospects yet to debut in MLB, who has the highest bust probability in your eyes? Best chance to succeed?
12:41
Dave Cameron: Baez seems to have a very high chance of being nothing. Mookie Betts will be a solid player unless he dies.
Let’s think about Javier Baez and Mookie Betts. Let’s see what we can do to effectively crowdsource their uncertainties.

