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Projection systems, like the well-known and highly-regarded PECOTA system, attempt to quantify the impossible: predicting baseball wins and losses through simple computer algorithms. No projection system is perfect, but they avoid the kinds of bias that permeate human predictions.
Here in Kansas City, of course, PECOTA projection systems are a little bit of a joke. They have a history of being, ah, off. Most famously, PECOTA pegged the Royals to win only 72 games the year they won 95 games and the World Series. About a year ago, I pointed out that PECOTA had under-predicted the Royals win totals every year for seven consecutive seasons.
Guess what, ya’ll? After yesterday’s win, the Royals have eclipsed the PECOTA projections for an eighth consecutive season.
PECOTA projections, 2010-2017
Year | PECOTA win projection | Actual win count | Difference |
---|---|---|---|
Year | PECOTA win projection | Actual win count | Difference |
2010 | 66 | 67 | 1 |
2011 | 66 | 71 | 5 |
2012 | 70 | 72 | 2 |
2013 | 76 | 86 | 10 |
2014 | 79 | 89 | 10 |
2015 | 72 | 95 | 23 |
2016 | 76 | 81 | 5 |
2017 | 71 | 80 | 9 |
Not only have the Royals won more games than PECOTA predicted them to for eight years, but the vaunted projection system has fallen on its face lately. It’s very likely the Royals will have beat the projections by five or more wins for five straight years.
Hey, at least PECOTA is consistent.
All-in-all, the Royals have averaged eight more wins per season than the numbers said they would over the last seven years, and have a chance to match that this year, too.
It’s fair to ask why this keeps happening. Traditionally, the Royals have had both a good bullpen and good defense, allowing them to close out more close games than other teams, though that hasn’t been the case this year. It could also be due to their high-contact tendency, avoiding strikeouts and eking out more runs than the situation should have yielded.
But this year’s Royals haven’t been as good on defense, and their bullpen resembles swiss cheese moreso than a fortress. So, you know, whatever. Who knows. All I know is that, for an eighth year, the Royals have at least achieved one major victory: beating the odds.