Half season rap-up: Home/road splits, one-run games, normalized records, and how the playoff picture is shaping up


Daniel Valois


We have now completed half of the inaugural Brassworld season, and it has been loads of fun so far. With a reasonable number of games played, we are now in a position to determine who the good teams are and how the playoff picture shapes up. There are two interesting questions we may want to ask ourselves at this point: (i) which teams are most likely to improve or regress in the second half? And (ii) which teams appear to have the best chances to win it all? This is all speculation at this point, but that’s the fun of it, right?


One thing that needs no speculation is that, judging from their current overall records, there are some very strong teams in this league. To name but one per division, Syracuse, Toontown, Virginia, and Maryland all look pretty good, both performance-wise and on paper.


However, won-lost records don’t always tell the whole story. Baseball is a game of skills, but also a game of luck, a fact that is conveyed in strat by the random rolls of the dice. Whether they are right or wrong, one result that sabermetricians (no, I’m not a stathead- not that there’s anything wrong with that …) attribute to random luck is the outcome of games that are decided by the slightest of margins, i.e. one run. Still, doing well in one-run games can sometimes end up being the difference between winning a pennant and a third place finish.


Another factor that tips the balance of results is, like in any sport, the home field advantage. Generally speaking, teams perform better at home than they do on the road. This might even be more of a factor in Brassworld given that home managers, if not playing via NetPlay, have the advantage of playing against their opponent’s computer manager. As carefully as one programs his CM, and as much as HAL has improved over the years, the fact remains that it’s not the optimal way to manage a team. Managing it yourself is. (That’s why I encourage everybody to use NetPlay as much as they can. Plus, it’s a lot more fun squaring off with another human being than it is with a cyber non-being. And, let’s face it, the win is much more satisfactory and the loss less frustrating.)


While it is difficult, if not impossible, to factor the overall effects of the random rolls of the dice out of a team’s record, it is possible with both one-run game results and home/road records; their effects are quantifiable. In doing so, and assuming that things remain the same from July to September, we get at least an idea of each individual team’s likelihood to improve, regress, or stay put in the second half. More precisely, the idea is that the less a team has benefited from the home field advantage and one-run game results (negative splits), the more likely it is to improve in the second half, while a team that has benefited the most (positive splits) is more likely to regress or stay put. In the process we may also be able to identify which teams will be the toughest come playoff time.


The method is not scientific, but it has some merit as it uses some kind of personalized version of the standard sabermetric approach random luck measurement (left out of the equation is the Pythagorean calculation of run differentials; I just don’t know the formula, and I’m not sure I’m a firm believer either). There are some caveats, though (more details below): The sample size is a little small, and the method is not foolproof. For one thing, the teams’ April-June overall record may have been affected by “bad luck” altogether in spite of neutral home/road and one-run game splits. Still it’s a fun way to break down the numbers and to look at each team’s individual performance beyond its overall won-lost record. Besides it still gives us a fairly accurate idea of the relative strength of the current .500+ teams.


On with the show.





Home/road splits


When determining how much a team deviates from the norm in any given performance measure, the first thing to establish is, of course, the norm itself. In the case of home/road splits, we want to know how all teams perform at home on average, and compare each individual team to this average in order to see whether a given team performs better or worse than the norm.


One-run games


This is pretty straightforward. Assuming that one-run games are determined by shear luck (and, yes, this is debatable), a team not affected by random results should have a .500 record in these contests. A better record than .500 is a negative (luck involved), a worse record a positive (bad luck involved).




Let’s illustrate with a fictitious example.


Say Team A has an overall record of 60-40, with a 34-16/ 26-24 home/road (H/R) split, and has a 10-6 record in one-run games. Let’s further say that the league’s average home-road differential is 2, i.e. that, on average, teams are 2 games better at home than they are on the road  (e.g. a team with a 20-30/18-32 split falls within the norm).


Team A’s home record is 8 games better than its home record, meaning that it performs 6 games better than the league average (8 minus 2); its 10-6 record in one-run games also says that Team A performs 4 games better than the norm. (IMPORTANT NOTE: Keep in mind that the fact that a team is x number of games over .500 in one-run games means that it has actually won x/2 games wore than it should have; for example, if 2 of the 16 one-run games had been decided in favor of its opponent, Team A would have played for .500, i.e. 8-8; the same reasoning applies to the H/R differential; as we will see shortly, this is taken into account in the overall calculation since all differentials are ultimately divided in 2). This is summarized below:


                                Games                                                   H/R game diff (= 8)                                One-run game diff.                        

                                Over .500                                minus league diff.

                                                                (= 2)

Team A                                20                                                            +6                                                           +4                                                                                          


The first impression we get from Team A’s splits is that, although it has a very solid record, it has also been somewhat “lucky” by performing better than the norm in both home and one-run games. It’s still a good team, but what we’d like to know is how good it really would be if we strip away random luck - or “over performance” - from its won-lost record. One way to achieve this is to deduct the over performance numbers from Team A’s overall record.  In this particular case the calculation goes like this:


20 – 6 - 4 = 10


That is, 20 games over .500, minus the 6 games over the league norm in H/R splits, minus the 4 games over .500 in one-run games. The resulting number is 10. This is what I call the Balanced Performance Indicator (BPI). This indicator tells us how many games over .500 a team should be if random luck is taken out of the equation. In Team A’s case, the BPI suggests that it should be 10 games over .500 instead of 20, i.e. its normalized record should be worse than its actual record.


To calculate Team A’s normalized record, we first establish what the .500 record should be given the number of games played by Team A. For 100 games played, the .500 record is 50-50. In order to get to the desired 10 games over .500 normalized record, we need to divide the BPI in 2 and add the result to the 50 wins, while subtracting it from the 40 losses. Dividing 10 in 2 is 5, and adding 5 to the wins and subtracting 5 from the losses yields a 55-45 record, 10 games over .500; that  is Team A’s normalized record.


Projecting Team A’s normalized record over 162 games and comparing it to a 162-game projection of its actual record gives un an idea of what Team A’s record would be if random luck did not enter the picture over an entire season.


 x number of (normalized) wins in y number of games à z number of wins in 162 games


we get a projected record (based on its actual 100-game record) of 97-65, and a normalized record of 89-73. That’s an 8-game difference, in other words, the potential difference between a pennant and a fourth place finish.


Let’s now look at the teams that are playing for .500 or better so far in our league.


Brassworld’s current .500 teams


Before we get into the teams’ records as such, we need to establish how home teams in Brassworld fare on average.


At this point, there have been 972 games played. Home teams have won 500 of those games, losing 472, good for a .514 average. The overall game difference is +28. Spread among the 24 teams, we get the average home team differential of 1.17. In other words, with respect to their overall records teams perform an average of 1.17 games better at home than they do on the road. Teams with a higher differential “over perform” at home, while teams with a lower differential “under perform”.


Concerning one-run games, it’s a zero-sum thing. As many teams win one-run games as they lose them. Consequently, I will just compute the number of games over .500 a team has in those contests.


Let’s now look at the teams with .500 or better records so far (I use this cut-off point both for simplicity (and laziness) as well as an indication of a team’s likelihood to make the playoffs as things stand right now; it does not mean that teams presently playing below .500 have no chance to make the playoffs; we still have a long, long way to go; I come back to this below). The splits for those teams look as follows (teams presented in alphabetical order):


Table 1. Home/road and one-run game splits for teams playing .500+  in the first half



                                                                                                                                                                                                                                      H#R game                                games

                                Overall                  pct.                                Home                     pct.                                Road                       pct.                                diff                                                diff.

Abilene                                44-37                                .543                                24-18                                .571                                20-19                                .513                                +2.5                                +1

Annadale                                41-40                                .506                                21-21                                .500                                20-19                                .513                                -0.5                                -1                           

Aspen                                48-33                                .593                                22-17                                .564                                26-16                                .619                                -2.5                                -1

Buckeye                                42-39                                .519                                24-18                                .571                                18-21                                .462                                +4.5                                +8

Greenville                                46-35                                .568                                26-16                                .619                                20-19                                .513                                +6.5                                +13 y

Lafontaine Park                                45-36                                .556                                23-18                                .548                                22-17                                .564                                -0.5                                +3                          

Maryland                                51-30                                .630                                26-13                                .667                                25-17                                .595                                +2.5                                -1

Plum Island                                45-36                                .556                                27-12                                .692x                                18-24                                .429                                +10.5                                0

Syracuse                                52-29                                .642                                29-13                                .690                                23-16                                .590                                +4.5                                +6                          

Toontown                                51-30                                .630                                27-12                                .692 x                                24-18                                .571                                +4.5                                -7

Virginia                                47-34                                .580                                21-21                                .500                                26-13                                .607                                -6.5                                -2                           

Waukesha                                48-33                                .593                                27-15                                .643                                21-18                                .538                                +4.5                                +1

West Oakland                                45-36                                .556                                22-17                                .564                                23-19                                .548                                +0.5                                +4


x- League high; league low: West Bend, –9.5

y- League high; league low: Taggart, Silver, -9


To illustrate how the game difference works, let’s look at my own team’s splits:




Lafontaine Park                                W                                L                                pct.                                Diff.

Road                                22                                17                                .564                         ---

Home                                23                                19                                .556                         0.5


This means that Lafontaine Park performs one half game worse at home than it does on the road.


From the data in Table 1 we see that:



Those are among the performances that deviate from the norm. So the question is, what should everybody’s record be if “everything else was equal”, that is, if all records were normalized to the league average? Let’s see.


The effect of random results on a team’s overall record is reflected in the BPI. As mentioned above, this indicator shows how many games over .500 a team should be if random luck was taken out of the equation. Let’s look at the table below (team presented in order of BPI, the calculation of which is explained in details right below Table 2)).


Table 2. Balanced Performance Indicator (BPI) rankings for teams playing .500+ in the first half


                                        Games                  H/R game diff. minus                    One-run             BPI                                                         over. 500             league diff.                                 games / 2                                                          

Virginia                                13                                                            -7.67                                                       -1                                21.67

Toontown                                21                                                            + 3.33                                                     -3.5                                21.17                      

Maryland                                21                                                            +1.33                                                      -0.5                                19.72

Aspen                                15                                                            -3.67                                                       -0.5                                19.17

Syracuse                                23                                                            + 3.33                                                     +3                                16.67

Waukesha                                15                                                            +3.33                                                      +0.5                                11.17

Lafontaine Park      9                                                              -1.67                                                       +1.5                        9.17

West Oakland        9                                                              +0.67                                                      +2                                6.33

Abilene                    7                                                              +1.33                                                        +0.5                                5.17

Annadale                1                                                              -1.67                                                       -0.5                                3.17

Plum Island             9                                                              +9.33                                                      0                                -0.33

Greenville                                11                                                            +5.33                                                      +6.5                                -0.83

Buckeye                  3                                                              +3.33                                                      +4                                -4.33


Let’s illustrate in details how we arrive at the BPI number using Aspen as an example.


So far, the Rainmen are 15 games over .500, while performing below the norm at home (-2.5) and in one-run games (-1). What we would like to know is, what would Aspen’s record be if the team had performed within the league’s norm? The idea here is that the two aforementioned factors (H\R splits, one-run game differential) should be credited to the team’s overall record in order to reflect the record it should have everything else being equal. So Aspen gets a 3.67 games credit for H/R splits (which is Aspen –2.5 H/R differentia minus the league H/R differential 1.17, i.e. (-2.5) – (1.17). In other words, Aspen has performed 3.67 games below the norm at home. Crediting this number to the team puts them at the league average in H/R splits; they also get a 0.5 games credit for the one-run game differential, that is, 1 divided in 2; this makes Aspen a .500 team in one-run games. The calculation comes to an overall credit of 4.17. Added to the 15 games over .500, the total comes to 19.17. This represents how many games over .500 Aspen should be if random luck was factored out of the first half results. With this, the Rainmen’s record is now normalized.



Here are the normalized records for all .500+ teams at half-point.


Table 3. Normalized records for teams playing .500+ in the first half (rounded to the next decimal)


                                Actual record               projected normalized record                                                                                                              

                                W                                L                                Adj. W                   Adj. L

Syracuse                                52                                29                                                            49                                32

Toontown                                51                                30                                                            51                                30                                                                                           

Maryland                                51                                30                                                            50                                31                                                           

Aspen                                48                                33                                                            50                                31

Virginia                                47                                34                                                            51                                30                           

West Oakland                                45                                36                                                            44                                37

Greenville                                46                                35                                                            40                                41

Lafontaine Park                                45                                36                                                            45                                36

Abilene                                44                                37                                                            43                                38

Plum Island                                45                                36                                                            40                                41                                                           

Buckeye                                42                                39                                                            38                                43

Annadale                                41                                40                                                            42                                39


Now, it would be interesting to see what the full effect of random luck would be over a full season. In other words, he next question is, what would each team’s record at the end of the season if be if the second if the second half played out like the first half? To see this, we need to project the normalized records over 162 and compare the results to 162-game projections of the teams’ actual records. Here’s what we find (rounded to the next decimal):


Table 4. Number of wins in the first half   projected over 162 games (ordered by normalized increase)


                                Actual                                normalized                                normalized increase

Virginia              94                          102                          8%

Aspen                96                          100                          4%

Annadale          82                            84                          2%

Toontown       102                          102                          0%

Lafontaine Park 90                            90                          0%

Maryland        102                          100                         -2%                                                                                                                               

West Oakland  90                            88                         -2%

Abilene              88                            86                         -2%

Syracuse         104                            98                         -6%

Buckeye            84                            76                       -10%

Plum Island       90                            80                       -11%

Greenville          92                            80                       -13%


THIS IS IMPORTANT: The number of projected normalized wins is not a prediction of the actual number of wins a team should have at the end of the year. Rather, it’s a way to measure the likelihood of a team to improve or not in the second half, and to identify those teams for which it could be more difficult to maintain their current level of performance. To be clear once again, I’m not saying, for instance, that Buckeye should win only 76 games overall. Luck or not, what was gained was gained. I’m only saying that stripping random luck off Buckeye’s first half won-lost record, and projecting the results over 162 games, we come to 76 wins. Comparing this figure with Buckeye’s projected actual record gives us an indication on whether we should expect the team to improve or not during the second half.


The normalized increase column is the important one in Table 4. Assuming that things eventually even out, the larger the difference between actual and normalized record, the more likely a team is to experience a change in performance. According to this calculation, there is one team that sticks out as the one most likely to improve in the second half: Virginia, followed by Aspen and, marginally, Annadale. All three teams have been unlucky on both fronts. They have a worse record on the road than at home, and have lost more one-run games than they have won. All three teams also play for over .500 on the road, which is a good sign for future performance. What sets Virginia apart as the team most likely to improve is the highest negative (positive for the Patriots) H\R splits of the current .500 teams. If this somewhat corrects itself in the second half, we’re in trouble (by “we” I mean my fellow National Leaguers and I).


At the other end of the spectrum, the calculation shows that it will very difficult for Greenville, Plum Island, and Buckeye to improve on their first half records of 46, 42, and 45 wins respectively. While both Greenville and Buckeye have over performed both at home and in one-run games, Plum Island comes even in the latter. However, the Greenheads have the largest H/R split differential in the league. More importantly, in spite of the fact that they have the highest winning percentage at home in the league, they are playing under .500 on the road by a healthy margin (for a contending team - they’re the only one of the 6 teams to have a .600+ record at home not to play for .500 on the road). Unless there’s dramatic improvement on the road, it looks like the ‘Heads would have to play at a .700 clip at home for the rest of the year in order to improve on their overall record in the second half. As for Greenville, they perform a little better than the norm at home, but they at least play for over .500 on the road, which bodes well. However, if those 13 games over .500 in one-run games revert to a more normal differential in the second half, improvement could be difficult. Buckeye is a particular case. They have better H/R splits than the norm and have won 8 more one-run games than they have lost, so there’s a possibility that these two factors revert back to the norm. In addition, Trader Ray went into a trading frenzy last month (which was a lot of fun to watch, by the way), therefore altering his June roster significantly, the effect of which I have absolutely no idea about.


Generally speaking, then, we may say that improvement in the second half is more plausible for those teams whose normalized increase is at or above 0%. The further from this neutral cut-off point, the more likely a change in performance is, in one direction or the other.


One thing to keep in mind is that random luck here is only defined in terms of H/R splits and one-run games. This does not include the overall random rolls of the dice, although some of it is built into the H/R and one-run game splits. More precisely it does not include the possibility that some team may have been lucky or unlucky the whole time both at home and on the road (I hope it’s clear at this point that good or bad luck only one way, e.g. bad luck only the road or good luck only at home, is included in the normalization). I have no idea how to do this, nor do I know if it’s in fact possible; or if it happens at all. But if you ran simulations of a league’s schedule, say, five times, chances are that you’d get significantly different results from time to time for one given team. What I do know is, the more data we have, the more likely that this factor is to be neutralized. With only three months’ worth of statistics, I’m not sure we can dismiss it.


Finally, the projections do not take into consideration the possibility that some teams improve the rest of the way due to trades, adjusted strategies, well-planned player usage, and a more favorable schedule.  All of these are factors that may alter the overall picture in Table 4.


Now, having said all that, although the calculation has some base in reality, this is all speculation, numbers, probabilities, and possibilities. It doesn’t mean the rest of the season will unravel as described in Tale 4. That’s because the methodology used to calculate the likelihood for teams to improve or regress supposes that random luck eventually evens out during the course of a season. Well, it doesn’t work that way. Things don’t always even out. And that’s a good thing. After all, that’s why we play the games.  


So, who’s going to defy the odds?


What’s in the cards for the Diamonds?


OK. Time to be self-centered now. Let’s look at the one team that I know best, the Lafontaine Park Diamonds, to get an idea of how things could develop in the second half, and how they could be different from the first half.


The team had a solid April at 16-10 (8-5 both at home and on the road) but a disastrous May at 13-16 (7-7 at home, 6-9 on the road), getting beaten in the process by scores of 16-9, 10-3, 13-0, and 10-1 (the latter two at home, to boot)!. Needless to say, the team’s ERA took a beating. The highlight of the month was the four losses in relief by usually reliable Jamie Walker. But the Diamonds bounced back in June with a 16-10 record (7-6 at home, 9-4 on the road).


Overall, the picture looks reasonably bright for a number of reasons.


First, the Diamonds have completely neutral splits, i.e. their projected record is the same as their projected normalized record. This means that luck, at least as defined in this article, did not play a major part in the team’s record. The team plays for over .500 on the road; it is fifth in runs scored, third in OBP, sixth in SLG., and in the middle of the pack in ERA (14th), and aside from the corner outfield positions the team’s defense is generally solid. The Diamonds have stolen only 22 bases, but they’ve also been caught only 3 times, the best success rate in the league, whatever that means; the roster boasts a collection of regulars who can either play most every day or take their regular turns in the rotation the rest of the way, and the bench and the platoons are solid. Finally, the team recently made two much needed acquisitions to bolster a middling pitching staff: Rodrigo Lopez and Braden Looper (although Lopez was a disaster in May, posting a 7.43 ERA; he bounced back in June with a 2.84 ERA), and two solid utility players- and much needed left-handed bats- in Geoff Blum and Damon Minor.


This all sounds very nice. But there’s a catch: The second half schedule. The next two months will be brutal for LPD. The team’s opponents? Among others:


July: Virginia (8 times), Aspen (3), Waukesha (3), West Oakland (3).

August: Abilene (8 times), West Oakland (6), Maryland (6), Virginia (6), Aspen (3).