Baseball HQ: Collecting plate appearances - who is on the rise?
on February 8, 2013 @ 13:27:01
By Bill Macey
One of the key components in compiling a winning fantasy baseball roster is simply maximizing plate appearances (PA) and accruing the accompanying counting stats. It follows that one of the biggest sources of profit comes from identifying and rostering players who earn more PA than the marketplace expects at the draft.
The purpose of this article is to identify potential new sources of profit in 2013 by looking for common characteristics of players that have earned 650 or more PA in the past. We selected the threshold of 650 PA for two reasons: First, it’s a good proxy for a full-time player because it works out to just about four PA per game over the 162 game season. Second, it’s a round number that makes the math easier!
For the purpose of the analysis, we only consider major-league PA. Minor league stats don't count in your fantasy baseball league so we don't count them here, either.
Analysis 1: Baseline
Since 1996 - the first full season after the 1994 labor stoppage - 309 different players have amassed 650 PA or more in a season, for a total of 886 such player-seasons, or about 52 individual 650-PA seasons per year. And since 2003, there have been 500 such seasons earned by 205 unique players. These data show that once a player reaches this threshold, he frequently repeats.
In the last few years, though, the number of batters reaching 650 PA has dropped. The last three seasons have averaged just 41 such seasons per year. One possible explanation is that trips to the DL are up (DL days reached an all-time high in 2012). An alternate, but not mutually exclusive, explanation is that managers are employing platoons more often than before.
Whatever the reasons, 650-PA seasons are becoming more rare – and therefore more valuable.
Analysis 2: Age
The median age of a batter reaching 650 PA is 28, with 80% of the seasons accounted for by players aged 31 or younger.
Baseball is a physically demanding game, and staying healthy throughout the long season is no easy feat. So it's not unreasonable to think that younger players are more able to play day after day. Similarly, the chart above is also consistent with typical career aging patters, where player performance peaks during the late twenties.
As players begin the decline phase of their career, they will find themselves more often benched for a platoon split or against a tough matchup, or they just might more often get a day off to stay fresh.
The results above represent the entire sample of players reaching 650 PA and thus include players who have reached this level of PA previously. So, as you might expect, the median age at which players record their first 650 PA season is even younger; that sub-sample has a median age of 26 and 76% of such seasons are posted by players 27 or younger.
Analysis 3: Consistency
Typically, these high-PA seasons do not come completely out of the blue. It’s quite rare for a player to jump from a low PA to everyday levels. Our analysis found that batters averaged 591 PA in the season before the one in which they earned 650 or more PA. And as expected, these players continued to get regular playing time, earning on average 597 PA in the season after their 650-PA season.
These prior-year averages were lower for players reaching the 650 PA threshold for the first time, who averaged just 460 PA in their prior season. However, once they reached the 650-PA threshold, they also continued to see regular playing time, averaging 585 PA in the subsequent season.
However, while the average isn't much different for first-timers than that of the larger population, the distribution was wider. About 51% of batters who reached 650 PA at least twice repeated in the next year. By contrast, first timers repeated in just 39% of the following seasons. The more often players reached the threshold, the more likely they were to reach it again.
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