Thursday, June 25, 2009
1999 World Series: Game 2
Wednesday, February 25, 2009
Dueling Projections

First, for the record, here are Nate's projections again (with A-Rod's past two years).

One thing I didn't notice before was that Silver's projection lasts two years beyond A-Rod's current contract. I'm going to go out on a limb here, but if A-Rod hits four home runs in 2017 and is at 726 total, I don't think the Yankees, or any team for that matter, are going to sign him.
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- Used the later years of Frank Robinson, Eddie Murray, Hank Aaron, Willie Mays and Babe Ruth to see, in total, how some of the greatest home run hitters of all-time have produced during their decline phases. I excluded Barry Bonds because of his atypical middle aged physical metamorphosis, despite the fact that he a A-Rod are both alleged PED users.
- Combined that and A-Rod's previous totals to develop a trend line for doubles.
- And for slugging percentage, factoring in his declining speed and the negative impact it will have on his SLG%.
- Combined those three lines into a conglomerate trend line I called his Projected Power Index (PPI)
- Estimated the ballpark effects of the New Yankee Stadium based on the prevailing weather patterns in April through September and the way it the diamond now faces.
- Used all of these in conjunction with his previous home run numbers, taking into account his steroid use in Texas (increased production minus park effects) to create his Projected Home Runs (PHRs).
- Decided all of that that would be way too difficult and possibly counterproductive, and instead picked the number "792" which would ensure that if he breaks the record, I will be closer than Nate by a couple of HRs. I then back-filled the numbers making sure there wasn't a drop off every single year since that was something I took issue with.
- Behold:
One of the things I said in the last post, but probably should have emphasized more was:
I realize that the most reliable way to predict future outcomes is by analyzing past events. However, the flaw in using this methodology is that it becomes impossible to predict when someone will do unprecedented things. Simply put, how is analyzing 20 guys, none of whom is the career home run leader, ever going to result in the simulation predicting A-Rod will break the all-time record?
Commenter scatterbrian nailed it:
It seems futile to attempt projecting a career that is an outlier. Rodriguez had 91 extra-base hits in his age-20 season, so we're dealing with a pretty rare player as it is. (DiMaggio and Pujols each had 89 in their age-21 seasons.) Using guys like Grich, Caminiti and Sandberg as comps doesn't seem fair to Rodriguez. Combined those three have only four seasons with 30+ homers. Rodriguez has hit less that 35 just one time.The point of an individual projection, at least to me, is not to produce a seemingly exhaustive and all-encompassing methodology. The objective is to be right.
PETCOA is obviously more complex and accurate overall than anything I could ever hope to construct. However, the point of the previous post was to call into question a method that is only going to produce one result: A-Rod falling short of the all-time home run record.
Silver's projection serves to remind us that A-Rod breaking Hank Aa-- er, Barry Bonds' record is far from a foregone conclusion based on pretty much every career path that has taken shape in the history of baseball. I just don't think A-Rod fits that mold.
Only time will tell.
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Oh and by the way, I made a similar projection for his home run totals this year, based on his performance in Spring Training. You probably won't believe it, but he is currently on pace for 162 HRs in 2009: A-Rod homers in first spring game [ESPN]
Tuesday, February 24, 2009
He Also Picked Mickey Rourke...
I took Rodriguez's top 20 PECOTA-comparable players and averaged their performances over each remaining season of their careers. Actually, the process was a little more complicated than that (each comparable's performance was adjusted for his park and league context, as well as his previous track record, and we had to make an accommodation for guys like Manny Ramirez who made A-Rod's comparables list but have yet to conclude their own careers). But the basic idea is simple: Comparables like Frank Robinson, who aged well, have a favorable effect on Rodriguez's forecast, and players like Caminini [sic] just the opposite one.And here are the projections (I've added A-Rod's two previous seasons in white):
There are three glaring problems to me.- Silver predicts a near-linear decline, with each total being 2-6HR lower than the preceding year. This, of course, is the result you are going to get when you take his "top 20 PETCOA-comparable players" like Silver did. If you take any 20 players and average their careers, the total number of home runs is almost always going to decline with age. Increase the sample size and it will always decline. The only problem is, over that ten year period it is extremely unlikely that any individual player is going to have that consistent of a downward slide. I will bet anyone reading $100 that this doesn't happen to A-Rod. First one to take the bet in the comments is on, we can iron out the details later.
- A-Rod is going to be able to DH at some point. Common knowledge would suggest that playing regularly in the field puts wear and tear on a body, draining energy in individual games and effectively shortening careers. Many of his comparables didn't have that luxury and were driven out of the league because they were no longer well-rounded players, not just because they could no longer be effective at the plate and hit home runs.
- The problem with being on pace to be the greatest home run hitter of all time is that you aren't going to have too many people similar to you.
Here are Alex's 20 comparables (and their career HR totals):
- Sammy Sosa (609)
- Bobby Grich (224)
- Dave Winfield (465)
- Ken Caminiti (239)
- Ryne Sandberg (282)
- Frank Robinson (586)
- Dwight Evans (385)
- Jeff Bagwell (449)
- George Brett (317)
- Reggie Jackson (563)
- Hank Aaron (755)
- Greg Luzinski (307)
- Albert Belle (381)
- Reggie Smith (314)
- Manny Ramirez (527, Inc.)
- Carlos Delgado (469, Inc.)
- Dick Allen (351)
- Doug DeCinces (237)
- Larry Walker (383)
- Tony Perez (379)
Granted, PETCOA's comparables are based on a ton of things besides home runs, but the problem with this list is that A-Rod already has more HRs than 16 of the guys on it. He has twice as many as his second and fourth closest matches and his career isn't over. I know Nate is going to lean on his own projection system for a variety of reasons, but it would probably have made more sense to look at the top 20 career HR leaders. We are, after all, trying to predict how many home runs he is going to hit and he's already #12 on the list.
I realize that the most reliable way to predict future outcomes is by analyzing past events. However, the flaw in using this methodology is that it becomes impossible to predict when someone will do unprecedented things. Simply put, how is analyzing 20 guys, none of whom is the career home run leader, ever going to result in the simulation predicting A-Rod will break the all-time record?
Look what happens when you line up A-Rod's projections with Hammerin' Hank's:
For one thing, last year, A-Rod played in only 138 games. If he played 156 games, he was on pace for almost exactly 43 HRs, right in line with a 32 year old Aaron.
Where the big differentials come in, are from ages 35-39. As A-Rod enters his steady plunge into oblivion (98HR, 19.6/year), Hank checks in with 203 round-trippers (40.6 per year) including the highest single season total of his career (47 at age 37).
There's no guarantee that A-Rod will hit even one more home run. He could get struck by lightning tomorrow. I just don't think that Alex is going to take the field on a consistent basis and gradually slide off into oblivion like PETCOA projects. The truly eye opening part of Silver's projection is that he'll would still only be 33 HRs away from the all-time record even if he is as bad as the simulation predicts.
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Before you leave a comment telling me how much of a moron I am, I've posted my own projections here.