If you haven’t taken a statistics class, regression can be rather tricky to grasp at first. It’s a word you’ll hear bantered about frequently on sabermetrically inclined websites, especially during the beginning of the season: “Oh, Albert Pujols is hitting .200, but it’s early so he’s bound to regress.” “Nick Hundley is slugging over .700, but that’s sure to regress.” This seems like a straightforward concept on the surface – good players that are underperforming are bound to improve, and over-performing scrubs will eventually cool down – but it leaves out an important piece of information: regress to what level?

The common mistake is to assume that if a good player has been underperforming, their “regression” will consist of them hitting .400 and bringing their overall line up to the level of their preseason projections. I like to call this the “overcorrection fallacy”, the belief that players will somehow compensate for their hot or cold performances by reverting to the other extreme going forward. While that may happen in select instances, it’s not what “regression” actually means. Instead, when someone says a player is likely to regress, they mean that the player should be expected to perform closer to their true talent level going forward.

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It looks like it’s not an April Fool’s joke – Matt Holliday is having his appendix out Friday afternoon. A tough spring has just gotten worse for the Cardinals. Approximately how many wins has the team lost in the last month? Let’s count it up.

First they lost as many as five wins when Adam Wainwright went down. Even if Kyle McClellan can replicate his league-averageish FIP work from the rotation (which isn’t likely, considering the penalty usually associated with such a move), the team lost at least about three wins when their young ace grabbed his elbow in pain.

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Given that the injury is now being reported as a hamstring strain, we can be pretty sure that his workload last year didn’t cause this injury. Still, the point of the post stands.

The hits just keep coming for the St. Louis Cardinals, as Chris Carpenter left the mound with the team trainer after throwing 32 pitches today. Following the loss of Adam Wainwright and the devastating blow of Nick Punto’s absence – as well as some contract talks that might not have gone very well – the Cardinals just can’t afford to keep hemorrhaging talent.

Carpenter, of course, is no stranger to the DL. He’s had both labrum and Tommy John surgery, and essentially missed entire seasons in 2003, 2007, and 2008. Carpenter has an extensive history of arm problems, so today’s news isn’t entirely shocking. That said, when Carpenter has been healthy enough to pitch, he’s been a workhorse. In 2005/2006, he was third in total innings pitched behind only Johan Santana and Brandon Webb. Last year, he threw 235 innings, tied with Dan Haren for the fourth most in baseball.

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The St. Louis Cardinals have had a rough few weeks. First, they failed to extend Albert Pujols‘ contract before the spring training deadline. Then, they lost ace Adam Wainwright for the season. In the aftermath, Vegas sportsbooks moved St. Louis from the favorites in the division to third behind the Reds and Brewers. Can the Cardinals compete without their ace in an improved division? If so, how?

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In the last couple days several players – most notably Adam Wainwright, but also Vicente Padilla and Nick Punto – have come up lame. Naturally, the loss of each of these players will have different effects on their teams’ respective win totals, as the Cardinals loss of Punto isn’t nearly as dramatic a blow as the news about Wainwright today. This season, I plan on tracking all players headed to the disabled list during the season including information on the injury, the amount of WAR and salary that were lost, along with several other factors

First of all, here is the spreadsheet to be viewed or downloaded containing all the players on or heading to the Nick Johnson List for 2011. As of right now, no player is officially on the DL, but several players will definitely be placed on the DL by opening day. I hope to keep this sheet updated daily by adding players as their information becomes available.

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