Showing posts with label regression. Show all posts
Showing posts with label regression. Show all posts

Thursday, July 22, 2010

Game 93: The Royal Scam

Tonight, the Yankees welcome the Royals to the Bronx for the first of a four game set. Luckily, Zack Greinke faced the Blue Jays last night (allowing two runs over 8 innings) and the Yanks will miraculously dodge him this time around.

CC Sabathia will take the mound for the Bombers this evening, a welcome relief after the bullpen has had to soak up 21 2/3 innings in the past three games because of Andy Pettitte's injury, A.J. Burnett's temper and Phil Hughes and Javier Vazquez's collective inability to get an out in the sixth inning.

The Big Fella draws consummate journeyman Bruce Chen (10 teams in 12 MLB seasons) tonight, who has the next lowest ERA in the Royals' starting rotation behind their young ace and is the only one who has a winning record (5-3).

Chen is walking a batter almost every other frame so far this season and striking out just over seven batters per nine innings. However, he has managed to keep his ERA and FIP down by allowing just six homers in 57.2 IP (0.94/9IP) due to a home run to fly ball ratio (7.1%) which is just about half of his career mark (14.1%).

Unless Chen has discovered some sort of magical formula for keeping the ball in the park, he is due to give up a few longballs. Fortunately for him, Chen is a lefthander, but maybe the Yankees can aid him regression to the mean tonight anyway.

And they wandered in,
From the city of St. John,
Without a dime,
Wearing coats that shined.
Both red and green,
Colors from their sunny island,
From their boats of iron,
They looked upon the promised land.
Where surely life was sweet,
On the rising tide,
To New York City,
Did they ride into the street.

See the glory,
Of the royal scam.

-Lineup(s)-

Yankees: Marcus Thames is DH'ing against the lefty as Jorge Posada returns behind the plate.
Derek Jeter SS
Nick Swisher RF
Mark Teixeira 1B
Alex Rodriguez 3B
Robinson Cano 2B
Jorge Posada C
Marcus Thames DH
Curtis Granderson CF
Brett Gardner LF

Thursday, April 29, 2010

Have The Yanks Over Or Underachieved So Far?

Good morning, Fackers. Through the first 1/8 of the season, the Yankees have won at a 65% clip, which, if continued throughout the entire season would net them 105 wins. Not too shabby, right?

Well, Darren Everson from the Wall Street Journal sees a bunch of guys who are well off their career numbers and determines that the Yanks haven't been that impressive:
The Yankees are hiding a dirty little secret: This team, despite its 13-7 record, actually hasn't played all that well.

We don't just mean over the past week, which saw them lose four of five before their 8-3 victory over the woeful Baltimore Orioles Wednesday night. We mean period.

...In total, there are probably 13 players on the 25-man roster who would be happy with their numbers if they maintained them all season. Yet not only are the Yankees playing .650 baseball, there's a feeling around the sport that this team is virtually certain to reach the postseason. Never mind that the Tampa Bay Rays, another team in the Yankees' division, have raced off to a 16-5 start.

This all means one of two things: Either the Yankees are going to be really scary once they get their individual acts together, or they're actually fortunate to be in the position they're in right now.
There are certainly guys on the Yankees who are struggling, but as a team they are balanced out by players who are performing better than expected. The Yanks' run differential aligns evenly with their actual record, so I disagree with Everson's implication that they "haven't played that well".

He names Mark Teixiera, Nick Johnson and Javier Vazquez are the prime Yankee underachievers and I think we can all agree that those guys are sure to improve as the season wears on. But the Yanks are also getting outstanding contributions from a lot of players that aren't likely to be maintain them once sample sizes start catching up to them.

Robinson Cano is hitting a scalding .390/.430/.701. He has 6 homers and 15 RBIs, paces that would add up to 48/120 for an entire season. Those aren't completely out of the question, but even the most ardent Cano supporters would settle for much less. Jorge Posada is at .316/.400/.649, a line that will be atrophied as the season wears on and he logs more innings behind the plate. Nick Swisher has a 140 OPS+ whereas the highest mark of his career is 129. Frankie Cervelli (185 OPS+) and Marcus Thames (240) have both contributed valiantly in their limited roles and will return to earth as they are given more and more chances.

On the pitching side of things, even with Vazquez's terrible start, the rotation has a 3.50 ERA. Andy Pettitte and Phil Hughes have been outstanding, with ERAs of 1.29 and 2.00, respectively. CC Sabathia is off to a great start. If A.J. Burnett could keep his mark around 3.20, it would be the lowest of his career. The bullpen has had some bad moments but overall, they've combined for a 4.30 ERA.

The only DL stint served by a Yankee player has been the one by Chan Ho Park and he's probably the 20th most important player on the team. It'd be nice if everyone was healthy all year long, but we know that's not going to happen.

I think the last paragraph of the quote from Everson's piece is a false dichotomy. Over any 20 game stretch of a season, individual players are going to be producing above, at or below what their numbers for the year turn out to be. However, when you combine everyone's production together, it typically evens out. When Teixeira, Johnson and Vazquez get their acts together, Posada, Cano and Pettitte will be returning to earth. The Yanks have played well so far, even if a few key players haven't.

Friday, August 28, 2009

A Few Lines On Coke

I have to admit, it wasn't until all the Twitter feeds came pouring into yesterday's live chat that I realized just how bad Phil Coke has been of late: 17 ER over his last 15.1 IP. His ERA has ballooned from 2.97 to 5.05 in that stretch.

Some may want to blame this on his over-use, as his 59 appearances are the most on the team by a good margin (Rivera is next with 52), and his 51.2 IP in relief is third behind Alfredo Aceves (61) and Rivera (53). And maybe that has something to do with it, but not very much.

Most of what's happened to Coke over these last 20 outings is just good old statistical correction. As I've stated before, particularly when evaluating relievers, I prefer to look at Fielding Independent Pitching (FIP) rather than ERA. As you may recall, FIP is dependent upon the three things pitchers can control: strikeouts, walks, and home runs, and is then is adjusted to an ERA-like scale.

Unfortunately, I can't find game-by-game logs of Coke's FIP, nor do I have the free time to calculate it at the moment. However, at every point this season that I looked at his numbers, his ERA was outperforming his FIP - by a lot. These past twenty outings have served to correct that gap, so much so that after yesterday, Coke's ERA (5.05) is now worse than his FIP (4.86).

So what's the good news/bad news here? The good news is that the numbers seem to indicate that Coke has at worst leveled off, at best is due for a small improvement. The bad news is that where those numbers stand right are not all that good. The good news is the Coke's strikeout (7.14 per 9) and walk (3.14 per 9) rates are slightly better than the league averages. The bad news is his home run rate (1.57 per 9) is a half home run worse than the league average, and that's what is killing both his FIP and his ERA.

Another number to look at is Coke's batting average on balls in play (BABIP). Evidence has shown that a pitcher has little control over balls in play (which is why FIP is a valuable statistic) and that most pitchers end up having a BABIP close to the league average. Currently, Coke is at .234, far better than the league average of .304. This could suggest that we haven't seen the bottom for Coke yet; if his BABIP regresses to the mean over the final five weeks he could be in for a few more rough outings.

However, given Coke's K and HR rates, I would expect his BABIP to be a bit low. His K rate is higher than the league average, meaning there are fewer balls in play against him. Furthermore, 6.1% of batted balls off Coke are home runs, as opposed to 4.0% for the league. As such, hitters are making contact less against him compared to the league, but when they do, the ball is traveling over the fence far more often. While the latter certainly isn't a good thing, I do think that indicates that Coke's BABIP likely won't get close to the league average by season's end. Besides, any BABIP regression to the mean may be a good thing for Coke, as it could indicate that his gigantic HR rate is dropping off a bit.

So what does it all mean? Phil Coke isn't as good as he appeared to be through most of the summer and isn't as bad as he appears to be right now. He gives up way too many home runs, and Yankee Stadium may have something to do with that (18.2 AB/HR at home, 25 on the road). If he can get his home runs down, his K and BB rates suggest he is a relatively effective pitcher.

Relievers are highly volatile due to the relatively small number of innings the pitch. One or two bad outings, like yesterday or Coke's 0.1 IP 6 ER disaster in Chicago on 8/1, can have a major impact on a reliever's statistics. Despite being a former starter with a decent arsenal of pitches, and despite his numbers being good against right handed batters for most of the season, Joe Girardi has insisted upon using Coke as a match-up lefty for most of the year, with 30 of his 59 appearances lasting less than an inning.

Coke has been pretty high up in the bullpen pecking order for most of the season. He'll need to show some improvement over these last five weeks to justify keeping that status in October. If he can keep the ball in the ballpark more often, he has a good chance at making those improvements.

Tuesday, July 28, 2009

Game 100: You Don't Know Me

There has been some recent talk that CC Sabathia has been disappointing this year, citing an increase in walks and a decline in strikeouts. His 3.67 ERA probably wasn't at the very top of the range of expectations at the beginning of the season, but he's averaged about 6 2/3 innings per start and racked up 10 wins.

When considering all possible outcomes before the season began, I would venture to guess that the Yanks would have signed up for that production without much hesitation. Historically a second half pitcher, now is the time of year that the big fella tends to find his stride. He's thrown 14 innings since the All-Star Break, allowed 3 runs and accumulated two wins. He was just getting warmed up before.

Going to the mound for the Rays will be their quondam lefty ace, Scott Kazmir. To call the 25 year old's performance so far this year "disappointing" would be a gross understatement. Although he's pitched only one truly full season in the Major Leagues, Kazmir has contributed significant value to Tampa Bay's rotation since he was called up to the Big League club in 2004 as a 20 year old. After completion of the 2008 schedule, he had pitched 722 regular season innings to a 3.61 ERA while striking out over one batter per inning. He fit the billing of the Rays' ace by general consensus entering the season; a lefty strikeout machine who, if he could ever make 35 starts or learn to control his pitch count, would be deadly.

He's certainly not going to make 35 starts this year, because he's already spend time on the DL and is only at 14. Given how poorly he's pitched, that's probably a good thing for the Rays. Kazmir's ERA is a gruesome 6.69 and his WHIP a ghastly 1.716. He's averaging fewer than 5 innings per start and has almost as many ER (55) as Ks (58). For a pitcher with a lifetime 9.5 K/9 ratio, that's bad news. His stint on the DL was officially caused by a quadriceps strain, but my skeptical side thinks he might, like Chien Ming Wang did, have had a nasty case of Badpitcheritis.

Kazmir has historically fared well against the Yanks, with a 2.65 ERA over 12 starts, but only a 5-4 record due primarily to his inability to go deep into games. He's also about a half of a run better at Tropicana Field than away from it, so it wouldn't be entirely shocking if he found his groove tonight. I would be surprised if he went more than 6 innings though, because he's only done it three times this year and the Yanks tend to work the count.

Rays fans might not recognize the 2009 version of Scott Kazmir, and who could blame them? Certainly not Brother Ray himself.


And anyone can tell,
You think you know me well -
Well, you don't know me.
(No you don't know me)