Wednesday, November 30, 2005
Josh Beckett's 4.08 ERA
Let's take a look at a few numbers to see how Josh Beckett would've done if he had pitched for the Red Sox in 2005. First, let's see some real numbers. In 2005 he had a 3.38 ERA, a 3.08 ERC, a 3.42 dERA, and a 3.45 RCERA. ERA is the normal measure of earned runs given up over 9 innings pitched that we all know and love. ERC is a statistic that measures what a pitcher's ERA is expected to be based on the hits and walks he gives up. dERA is based on the work done by Voros McCracken and measures a pitcher's ERA based entirely on the statistics that a pitcher controls and the defense does not (K's, BB's, HR's, and HBP's). RCERA is a pitcher's ERA based on the Runs Created by the batters facing the pitcher. All four are relatively close to each other and it should be possible to tailor the last three stats to see how he would've performed in the AL in a hitter's park.
I started off by park adjusting the number of doubles, triples, home runs, and hits that Beckett allowed at home. I used the park indices in the Bill James Handbook to calculate the number of those four stats that he would've allowed had he pitched half his games in Fenway instead of in Dolphins Stadium. Then I plugged those new numbers into the formulas for ERC, dERA, and RCERA. His numbers for those three went up to an ERC of 3.25, a dERA of 3.46, and a RCERA of 3.68; an increase of 0.17, 0.04, and 0.23 respectively. Judging by those three numbers we could probably expect Beckett's ERA to increase anywhere between 0.04 and 0.23 points giving him an ERA anywhere between 3.42 and 3.61 had he pitched in Fenway park. But what about the effects of the DH?
In 2005 Beckett held number 9 hitters to a .121/.188/.172, very similar to the line NL pitchers combined for in 2005, .150/.180/.190. My methods are far from perfect, but just for fun let's replace the 63 pitcher plate appearances against Josh Beckett with 80 DH appearances, assuming that the DH would be batting higher in the order, therefore getting more plate appearances. The average DH in the AL put up a .260/.335/.444 line in 2005. As a little side note, Baltimore DH's, lead mostly by Jay Gibbons, Sammy Sosa, Javy Lopez, and Raphael Palmeiro, had a .210/.277/.362 line. That was, by far, the worst in the AL despite the fact that they outslugged Oakland DH's by .010. But anyways, let's figure out ERC, dERA, and RCERA while keeping his stats park adjusted for Fenway, but adding in the effects of a DH. Doing that changes his numbers more than I expected. His ERC jumped to 3.87, his dERA to 3.82, and his RCERA to 4.36; a change over his original numbers by 0.79, 0.40, and 0.91 respectively.
The average change in the three stats I looked at and adjusted was 0.70 after adjusting for Fenway and replacing 63 pitcher plate appearances with 80 DH ones. What do all these numbers mean? Well, going by my math (which, I'll admit is a little bit shaky, but it might be a good estimation), Josh Beckett would've had a 4.08 ERA had he been with the Red Sox last year. Also, the Red Sox scored 5.62 runs per game last year which is actually lower than the 5.89 run support over nine innings that Beckett got. With the jump in ERA, support of one of the worst bullpens in baseball, and not much of a difference in run support it's probably a safe bet to say that had Beckett been in Boston last year his record would've been worse than the 15-8 he had in Florida.
This was by no means a way to try and prove that the Beckett trade was a bad one. I still love that trade. Beckett is going to get better as he matures and the rest of the deal still works out in Boston's favor. Beckett will be a great number 2 starter for the Red Sox over the next few years.
Sunday, November 27, 2005
Is Fenway really a hitter's park?
I figured I'd check to see how much of a pitcher's park they have down there in Miami compared to Fenway. According to the Bill James Handbook, over the last three years the park index for runs scored in Dolphins Stadium is 90. A 90 means that 10% fewer runs are scored in Marlins games at home compared to Marlins games on the road. A 100 would mean that the park is neutral in terms of offense. Fenway has a 10% swing the other way with a 110 park index for runs over the last 3 years. Something is a little off when you look at Fenway splits, however. Red Sox opponents scored 1059 runs against them in 216 Fenway games. In 216 Red Sox away games their opponents scored 1060 runs. In Fenway, Sox opponents combined for a .264/.317/.422 line compared to a .267/.324/.424 line against the Sox away from Fenway. So Sox opponents were actually very slightly better on the road then they were in Fenway. So why is Fenway considered to be such a hitter's park? Well, over the last 3 years the Red Sox have scored 1343 runs in Fenway while scoring only 1122 on the road. They have a very impressive .297/.372/.492 line in Fenway over the last 3 years compared to a .265/.335/.440 line. In other words, the 10% increase in run production at Fenway park is entirely because of the Red Sox and Fenway is actually a neutral park for opposing line ups.
The fact that Fenway isn't a hitter's park for the away team's line up will make things a bit easier for Josh Beckett, but it does raise a few questions as to why Fenway only seems to help Boston. Does the crowd pump them up that much? Are they so used to everyone expecting them to do better at home that they step up their game that much? There are a lot of people who say that a hitter is built for Fenway or has the perfect swing for Fenway. Guys like Bill Mueller and Nomar Garciaparra are said to be Fenway type hitters. Are the Sox able to spot the type of hitter that will do well at Fenway and do they stack their line up with these guys? I know Kevin Millar loves to put the ball in foul ground. Maybe the fact that there is no foul ground at Fenway helps the guy out. I really don't know if there's any one factor that boosts Boston's offense so much when they're in Fenway.