Baseball Musings
Baseball Musings
May 11, 2006
Pujols and Records

The St. Louis Post-Dispatch notices that Albert Pujols is not only on a record setting home run pace, but a record setting RBI pace as well.

Pujols' previous home run high was 46, in 2004. In a related development, Pujols, who leads the majors with 43 runs batted in, is on pace to drive in 199. Hack Wilson's record, set in 1930 for the Chicago Cubs, is 191.

So, how many homers is Albert going to hit? Let say that Albert falls back for the rest of the season to his career home run rate, one every 14 at bats. Since Albert always gets 590 at bats (his career at bats: 590, 590, 591, 592, 591), we'll say he has 474 at bats left. That would give him 34 more home runs for 52. Not a record, but certainly an impressive total, and one that would solidify his chances at breaking Aaron's career record.

We need to ask if these 18 home runs represent a new level of performance. Based on his career through 2005, the probability of an Albert Pujols at bat ending in a home run was 0.068. The 95% confidence interval for home runs in 116 at bats for that probability is 3 to 14. Pujols is way over that. The probability that Albert, given his career numbers would hit 18 home runs in 116 at bats is .00086. It sure looks like there's something different about Albert's home run power this year.

It's not just the new ballpark. Albert's home run rate is way up there, but it's also way up on the road:

Pujols HR/AB2001-20052006
Home.065.169
Home.071.137

So what's a good rate to use for future predictions? A home run probability of .095 puts 18 in the 95% confidence interval for 116 at bats. That would give Albert 45 more home runs on the season (his career high is 46) for a total of 63. Past former Cardinal Roger Maris, but well short of the record.


Posted by David Pinto at 08:20 AM | Sluggers | TrackBack (0)
Comments

Has the location of his homers changed this year? I've only seen a few pulled to left, so I can't really make a judgement.

Posted by: Will at May 11, 2006 10:04 AM

His doubles seem to be down. Maybe he's just getting a little lucky and having more doubles turn into HR. If you look at his doubles vs HR they are normally pretty close (e.g. 38 vs 41 last year). This year he has 18 HR and only 6 doubles. To me that says he should have about 12 of each. That's probably well within the 95% c.i. using his career HR rate.

Posted by: bruce at May 11, 2006 10:51 AM

Here's a couple of examples of prior feats by Albert that are similar to this year so far (counting all XBH the same).

May 2003: 12 doubles and 10 HR in 116 AB

Aug 2004: 10 doubles, 1 tripple, 12 HR in 114 AB

My guess is this is not another level.

Posted by: bruce at May 11, 2006 11:00 AM

There are some interesting stats at THT for Pujols. I don't know what they mean at this point in the season, but:

LD%, and GB% are down substantially, which means that he's hitting lots more fly balls. On top of that his HR/F is up. Maybe he IS taking a different approach at the plate this year.

BA / RISP is way high (.519). Looks like in the past it's been close to his BA. This looks flukey to me and it's a likely to be large part of why his RBI are so high.

Posted by: bruce at May 11, 2006 11:44 AM

maybe his "hurt back" is the ticket

Posted by: lisa gray at May 11, 2006 12:20 PM

Albert's walk rate is up this year, and likely will stay up as his superhumanness continues, so his at bat figure may tumble a bit from his incredibly consistent 590 figure and give him fewer chances at hitting home runs. Also goes to show how ridiculous Hack's 191 RBI were . . .

Posted by: The Alchemist at May 11, 2006 12:27 PM

Didn't he have a problem with plantar fasciitis last year? Has that gone away or is he still dealing with that?

Posted by: bruce at May 11, 2006 12:33 PM

How do we know Pujols isn't juicing?

Posted by: Mike at May 11, 2006 12:35 PM

I've watched nearly every at-bat this year and the last half of last year, and it is obvious he is swinging for the fences more this year. In general it seems that when the cardinals are losing big, or when they are winning big, and there is no one on base, he is going to either pop up or hit a home run. When it is close or with men on base ahead of him he hits a scorching line drive at somebody or hits a line drive home run. His swing seems totally different on these. He used to be a great all-around hitter who hits home runs too, and now I think he is taking the "home run hitter who is a great all-around hitter" approach.

He's also being much more selective at the plate, and he is having a lot more pitches called his way. He seems to have developed an ability to foul off pitches that are undrivable strikes, even or especially on 2 strikes, instead of hitting ground balls base hits like he did in the past. And of course he is capitalizing on mistake pitches.

Obviously the steroids comment is every cardinals fan's worst nightmare, but I think it is unfounded. Unless he was juicing when he was 19, he is clean.

Posted by: SleepyCA at May 11, 2006 01:32 PM

AFAIK, he still has his plantar fasciitis. He just plays with it.

Anyway, I would agree with what Sleepy has said. As a Cardinals fan, his approach does seem different than years past. I think largely because the rest of the team has gotten worse offensively, and Albert is pretty much the entire offense.

Posted by: JeremyR at May 11, 2006 03:56 PM

1) No way Albert is juicing. His body type hasn't changed. In fact, he's slimmer than he was at 19. Less baby fat, at least.

2) His HR pace puts him over the "Non-Steroid Single Season Home Run" record, which remains at 61.

Posted by: Pokey Joe at May 11, 2006 06:16 PM

As a cards fan, I agree 100% with sleepy. Albert never tried to hit home runs before. they just came from hitting the ball as hard as he does, if that makes sense. This year, he's aiming over the fences.

Posted by: Chris G at May 11, 2006 06:55 PM

The fact that Albert's current level of performance is outside the confidence interval might mean it is unlikely to simply be random variation or luck. But that does not mean it is a permenant new level of performance, either.

Sometimes hot streaks come not because of unexplained variance, but because something really is different -- it's just that that something just doesn't always STAY different.

Posted by: Steverino at May 12, 2006 12:07 AM
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