Who is not MVP in 2010?

The NBA has essentially reached the midpoint.  As of last night, only five teams – Boston, Charlotte, Chicago, Golden State, and Milwaukee — have yet to play 41 games.  As each team reaches the 41 game mark I have measured the productivity – via Wins Produced – of each player these teams employ.  After this weekend I will analyze the remaining five teams, and then I will offer a series of posts analyzing what the NBA looks like at the midpoint of the 2009-10 season.

As we wait, though, let me offer a brief comment on the MVP race.  And here it is:

For those who think Carmelo Anthony is the most productive players in the NBA… well, I ain’t seeing it.  Carmelo leads the NBA in scoring, but after 41 games Melo has only produced 4.5 wins and posted a 0.160 WP48.  Yes, Melo is above average.  But I don’t think he’s an MVP.

What about Kevin Durant?  He has clearly improved from what we saw his rookie season (and yes, I still think he improved during his second season).  Currently he is third in the NBA in scoring and after 41 games he has posted 8.2 Wins Produced.  And although his WP48 stands at 0.240, he’s also not the most productive player in the game.

And then there is Kobe.  He’s fourth in the NBA in scoring but has only produced 6.0 wins after 41 games.  And although producing about twelve wins in a season is very good for a shooting guard, it isn’t going to lead the NBA in 2009-10.

So who is the most productive player thus far in 2009-10?  Well, I will discuss that and other topics… starting on Sunday.

- DJ

The WoW Journal Comments Policy

Our research on the NBA was summarized HERE.

The Technical Notes at wagesofwins.com provides substantially more information on the published research behind Wins Produced and Win Score

Wins Produced, Win Score, and PAWSmin are also discussed in the following posts:

Simple Models of Player Performance

Wins Produced vs. Win Score

What Wins Produced Says and What It Does Not Say

Introducing PAWSmin — and a Defense of Box Score Statistics

Finally, A Guide to Evaluating Models contains useful hints on how to interpret and evaluate statistical models.

The Shooting Guard Penalty

So you want to be “like Mike?”  As noted by David Biderman of the Wall Street Journal, there is a downside to this objective.  It appears that shooting guards – relative to the other four positions the NBA employs — are getting ‘short’-changed.

Biderman’s article draws upon a story we very briefly note in “Stumbling on Wins” (our next book).  After controlling for a host of explanatory variables (player performance, team performance, games played, age, market size, draft position, etc…), we find that shooting guards are paid less (about $1.44 million less per season) than players at other positions.

This result appears to be driven by the “short supply of tall people.”  As observed in The Wages of Wins (our first book), the labor market in the NBA is characterized by a limited supply of workers.   There simply are not many tall people for basketball teams to consider hiring. Or on the flip side, there is a relatively large supply of little guys.

When we think about free agent salaries in the NBA the story that stands out is that scoring is over-emphasized.  Points scored (as opposed to shooting efficiency, rebounds, steals, turnovers, etc…) have the largest impact on a player’s salary.  So NBA teams do not get everything “right” when it comes to evaluating free agents (and a similar story can be told for draft position, minutes played, etc…).  But when it comes to the evaluation of shooting guards, this decision seems to be essentially correct.  The abundance of these players suggests teams should be able to acquire shooting guards for a discount.

Two more notes on this story….

  • the abundance of shooting guards means it is harder for an elite guard to differentiate himself from his peers.  This can be seen when we look at the top players – according to Wins Produced (a measure that evaluates each player relative to position played) — at each position.  Only four shooting guards had more than ten Wins Produced last season (Dwyane Wade, Brandon Roy, Mike Miller, and Kobe Bryant).  In contrast, at the other positions we see eight point guards, seven small forwards, seven power forwards, and nine centers who were in double digits in Wins Produced.
  • the story we see with respect to salaries is also seen with respect to the NBA draft.  Controlling for performance (and a host of other factors), shooting guards are taken later in the draft. As we get closer to the NBA draft I will offer more on this subject (it is also in the next book).

Let me close by noting that this is not the first time Biderman has referenced my work at the Wall Street Journal.  Here are three more recent stories from Biderman that reference my research.

After Age 25, It’s All Downhill for NBA Players

In the NHL, More Dollars Equals More Wins

Few Starting Lineups Could Top These Celtics

One should note that both the shooting guard and aging story are briefly noted in Stumbling on Wins (the book has many, many more stories).  And while you wait for our next book (just a few more weeks), I highly recommend the sports section at the Wall Street Journal.  Here is a brief selection of recent stories:

We’re Picking the Jets to Win—Again (for insights into picking NFL games)

A Random Walk to the End Zone (a comment – from “Fooled by Randomness” author Nassim Nicholas Taleb – on fantasy football)

11 Minutes of Action (how much time is there really in a football game?)

In the NBA, 3 Is Cheaper Than 2 (check out Evan Eschmeyer’s – former NBA player — post in the comment section to this article)

What Price Vikings Fandom? Funny You Should Ask (the value of being a fan, from the research of Colorado College economist Aju Fenn)

The Count: Arenas’s On-Court Liability (Gilbert Arenes doesn’t help as much as his reputation suggests)

The Count: Hall of Fame Voters Snub Stats (what the stats say about who should be in baseball’s Hall of Fame)

What do these stories have in common? The Wall Street Journal is really emphasizing what the numbers say about sports.  So if you haven’t already, take a look at the sports coverage offered by the Wall Street Journal. For those who like numbers and sports, the Wall Street Journal sports page is a place to go.

- DJ

The WoW Journal Comments Policy

Our research on the NBA was summarized HERE.

The Technical Notes at wagesofwins.com provides substantially more information on the published research behind Wins Produced and Win Score

Wins Produced, Win Score, and PAWSmin are also discussed in the following posts:

Simple Models of Player Performance

Wins Produced vs. Win Score

What Wins Produced Says and What It Does Not Say

Introducing PAWSmin — and a Defense of Box Score Statistics

Finally, A Guide to Evaluating Models contains useful hints on how to interpret and evaluate statistical models.

Mixed Messages on Chris Bosh

One of the prizes in the 2010 free agent market is Chris Bosh.  His status in the market can be seen when we consider that across the past four seasons Bosh has

  • averaged at least 22 points per game.
  • been named to four All-Star teams.
  • been named second team All-NBA (in 2007).
  • consistently ranked in the top 20 in Player Efficiency Rating.

In sum, the conventional wisdom suggests Bosh is an elite NBA player. 

Bosh and Wins Produced

Prior to this season, though, the Wins Produced story was slightly different (not completely different, just slightly).  Since 2005-06, Bosh has produced 40.2 wins in 10,762 minutes.  This works out to a WP48 [Wins Produced per 48 minutes] of 0.179.  With a career high WP48 of 0.210 (2006-07 was the only season he exceeded the 0.200 mark), Bosh appeared to be “good” player.  But he’s not on the level of the elite players in the game.

At least, that was the story before 2009-10. 

As Table One reveals, after 39 games this season Bosh is posting a 0.267 Wp48.  This is not at the level of Chris Paul or LeBron James.  But Bosh’s projected Wins Produced probably ranks among the top 10 or 15 in the league (I will know more on this in a couple of weeks after every team has played 41 games).

Table One: The Toronto Raptors after 39 games in 2009-10

From Table One we see that if each veteran player on the Raptors maintained what he did in 2008-09, Toronto would be on pace to win 28.1 games this season.  The players’ performances this season, though, suggests a team that’s going to win 35 games. 

Examining the numbers for the individual players reveals that the change we observe with respect to Bosh’s production explains virtually all of the team’s improvement.  In other words, if Bosh maintained what he was doing last year, the Raptors – after all the changes made this summer — should have expected to win about 13 of their first 39 games.  And that mark would rank Toronto among the Pacers, Wizards, Pistons, and Sixers.  So if Bosh doesn’t improve, the Raptors are looking at the NBA lottery.

With Bosh improving, though, the Raptors have a good chance of making the playoffs.  And if that happens, Bosh has a good chance of experiencing a first round exit for the third time in his career.

Yes, Bosh had yet to experience much team success with the Raptors. Hence one suspects he might depart Toronto this summer.  And consequently, the Raptors have an incentive to trade him now.

A Super Dynasty with Bosh?

One possible destination is the LA Lakers.  It has been suggested that the Lakers send Andrew Bynum to the Raptors for Bosh (other players would have to be added to make the trade work, but Bynum and Bosh are the key players in the trade).  Such a proposal has apparently caused Andrew from Waiting for Next Year – a blog about Cleveland sports – a great deal of consternation.   Andrew explores how the Bynum-Bosh trade could happen and then concludes: “This deal would seemingly turn the Lakers into a super dynasty and give the Cavaliers little chance of being able to overcome the Lakers’ supremacy.”

I read this sentence before I looked at what Bosh had done this season. Since I knew that Bosh and Bynum produced at similar levels prior to this season, when I first read Andrew’s take on this proposal I had a hard time believing that such a trade would shift the balance of power in the NBA significantly.

But seeing what Bosh is doing this year, I guess there’s some reason for the other contenders in the NBA to be a bit nervous about a Bynum for Bosh trade.  For example, if Bynum was playing at Bosh’s level this year, the Lakers would be on pace to win about 64 games, or about six more projected wins than we currently see (and if Gasol was healthy, this projection is even higher).  And a Lakers team on pace to win 64 games would currently be the best team in the NBA. 

There are two issues, though, to consider. First of all, Bosh has never produced at this level in the past.  And if Bosh reverts to what we saw before this year – as I just noted — than the Lakers would not really be getting much more than what they are getting from Bynum. 

Furthermore, even if Bosh does maintain what he is doing this year, a 64 win team is hardly an insurmountable dynasty. The Cavaliers are currently on pace to win 59 games this year, and the difference between 64 and 59 wins isn’t really that great.  Yes, the Cavs would have to do a bit more to close to the gap.  But the gap could be closed (and even if it isn’t closed, it’s more than possible for a slightly worse team to win an NBA playoff series).

So although I think a Bynum-Bosh trade could make the Lakers the favorite to win in 2010, I don’t think the Lakers would be over-whelming favorites or a super dynasty.

Let me close with more thought on the Lakers.  If it’s true the Lakers are considering this move, it does tell us something about how the Lakers currently evaluate their own team.  There are pundits who believe the Lakers are already “the dominant team” in the NBA.  The fact that the Lakers are pursuing Bosh (that is, if they are) suggests the Lakers may not believe they are currently dominating the NBA (or maybe — since this is about mixed messages — this doesn’t mean that).

- DJ

The WoW Journal Comments Policy

Our research on the NBA was summarized HERE.

The Technical Notes at wagesofwins.com provides substantially more information on the published research behind Wins Produced and Win Score

Wins Produced, Win Score, and PAWSmin are also discussed in the following posts:

Simple Models of Player Performance

Wins Produced vs. Win Score

What Wins Produced Says and What It Does Not Say

Introducing PAWSmin — and a Defense of Box Score Statistics

Finally, A Guide to Evaluating Models contains useful hints on how to interpret and evaluate statistical models.

A History Lesson from Detroit that Seems to be Repeating

On Monday evening the Detroit Pistons were blown out by the Chicago Bulls.  This was Detroit’s 13th consecutive loss, the team’s longest losing streak since the 1993-94 season (thankfully the streak ended on Tuesday night). When I saw the comparison with the streak from more than 15 years ago my thoughts turned back to that 1993-94 campaign.  So today’s post is going to about this particular Pistons team.  Specifically I am going to compare my thoughts at the time (at least, what I remember of my thoughts) to what my analysis today says about the 1993-94 Pistons (with a brief comparison to today’s team).

Thoughts from 1993

Back in 1993 I was a long-haired (literally) graduate student, focused on taking classes and learning how to teach (I started teaching my own classes at Colorado State in the fall of 1992).  My research on basketball had not begun (and wouldn’t begin in earnest until 1995).  In fact, in 1993 much of the research on basketball we discuss today had not begun (or was only in its infancy).  Despite the scarcity of empirical research, though, I was blessed – like so many young basketball fans (I was only 24 at this time) – with many opinions.   

Before I get to these opinions, a brief history lesson.  In 1984 the Pistons made the first of nine consecutive trips to the NBA playoffs (after missing the playoffs the previous six seasons).  Within this streak Detroit won two NBA titles in 1989 and 1990.  But in 1992-93 – with Dennis Rodman missing 20 games — the Pistons won only 40 contests and missed the playoffs by just one game. 

Before the 1992-93 campaign began the Pistons sent John Salley to the Miami Heat for a first round pick in the 1993 NBA draft.  The Heat only won 36 games in 1992-93, hence the Pistons ended up with the 10th and 11th picks.  With these choices, the Pistons selected Lindsey Hunter and Allan Houston.   I can still remember Dick Vitale insisting that Houston was going to be a star (as we will see, in his first year Houston was not).  And Lindsey Hunter – from Jackson State – once scored 48 points in a game against Kansas.  So fans of the Pistons fully expected Hunter to eventually take over for Isiah Thomas and Houston to be an outstanding player (after all, Dickie V said so!!).

Eventually, though, is the key word.  For the 1993-94 season the Pistons still had both Isiah and Joe Dumars.  Both guards had played in the 1993 All-Star game and both would eventually be voted into the Hall-of-Fame.  So with two All-Stars and two lottery picks, Detroit’s backcourt was expected to be very good.

Beyond the backcourt, the team also employed other talented players (or at least, players who were supposed to be talented).   At the time Hunter and Houston were drafted, Rodman was still with Detroit.  In October, though, the Pistons sent Rodman – and his 7.0 points per game and various off-court issues – to the San Antonio Spurs for Sean Elliott and David Wood.  In 1989 the Spurs selected Elliott with the 3rd choice in the NBA draft.  And in 1992-93, Elliott averaged 17.2 points per game and appeared in the All-Star game.  I can still remember hearing about this trade and being quite excited.  Imagine, a head case and non-scorer like Rodman being traded away for an NBA All-Star.  It seemed impossible for that scenario to work out any better.   

With this deal the Pistons now had three All-Stars in the starting line-up (Thomas, Dumars, and Elliott).  But this was not all the team had on the roster.  Terry Mills – from the University of Michigan – was signed as a free agent in 1992.  In 1992-93, Mills averaged 14.8 points per game and dropped 41 points on the Celtics in one game in March.  In addition, the Pistons began the season with Bill Laimbeer, Olden Polynice, and Greg “Cadillac” Anderson joining Mills in the frontcourt. 

So the Pistons started the 1993-94 with three All-Stars, two lottery picks, a scoring forward (Terry Mills), and three productive big men.  With such a roster, I fully expected the Pistons to return to the playoffs in 1994.  And such was the argument I made frequently to my fellow basketball fans at Colorado State University.

Again, in 1993 I had not started my research in sports and economics. So my opinions – which I certainly considered well-informed at the time – were based strictly on my observations of the NBA.  Such observations were based on more than a decade of watching and thinking about basketball.  In sum, at the age of 24, I very much considered myself a very knowledgeable NBA fan.  In fact, like many young basketball fans, I considered myself an expert.

The Wins Produced Story

Despite my expertise and opinions, though, the Pistons in 1993-94 were awful.  The team suffered losing streaks of 8, 14, 6, 7, and 13 games.  And when the season ended, the Pistons had only won 20 games. 

So where did the Pistons go wrong?  How could a team with three All-Stars lose more than 60 games? 

Various explanations were offered at the time. Apparently Isiah and Sean Elliott didn’t get along; consequently, Elliott’s scoring average dropped.  Laimbeer also retired before the end of November and Olden Polynice was traded in February to the Sacramento Kings for Pete Chilcutt.  Such moves clearly didn’t help. 

But chemistry and player transactions don’t tell the entire story.  Let’s imagine that we go back in time and re-visit the construction of the 1993-94 Pistons.  If we consider what these players did in 1992-93 – via Wins Produced – would a Pistons fan still be very optimistic in November of 1993?

As Table One indicates, the data suggests that I wasn’t quite the expert I believed myself to be at 24 years of age.  At least, I wasn’t much of an expert then if we believe what my research indicates today.

Table One: The Detroit Pistons in 1993-94

If we consider what the players the Pistons employed did in 1993-94 prior to that season, we would have only expected this team to win about 13 games.  Of these 13 wins, only about 11 could be traced to the expected play of Isiah, Dumars, and Elliott.  In other words, the three All-Stars were simply not that productive in 1992-93.  And in 1993-94, this trio did even less (only 3.4 Wins Produced).  This analysis does indicate that Elliott didn’t play well in Detroit.  But it also tells us that even if each All-Star maintained his production from 1992-93 the Pistons still wouldn’t have been very good.

When we look at the 1992-93 production numbers we see that not only were the All-Stars not very productive, most of the roster didn’t offer much.  An average player posts a WP48 [Wins Produced per 48 minutes] of 0.100.  Looking at the 1992-93 numbers we see only four players – Polynice, Anderson, Elliott, and Laimbeer – surpassed the mark of an average player. And none of these players reached the 0.150 mark in 1992-93. 

In 1993-94, the population of above average players was smaller.  Still, Polynice, Anderson, and Mills improved and each surpassed the 0.100 mark.  And these three players combined to produce 20.4 wins.  Unfortunately the rest of the roster combined to produce 0.0 wins. 

Part of the problem was the two lottery picks.  Both Allan Houston and Lindsey Hunter were in the negative range. And Mark Macon and Marcus Liberty – two young players acquired in November – were also in the negative range. Had these players not been in the negative range – and the All-Stars maintained what we saw in the 1992-93 – this team could have won about 37 games.  They still would have missed the playoffs (so I still would have been wrong), but the Pistons wouldn’t have been as bad as they were.

Lessons Learned

One of the lessons learned from this story is that at the age of 40 we tend not to look kindly upon our thoughts at 24.  At least, that story is true for me (by the way, this is probably the same story at 60 when we look back at what we say at 40).

Beyond the personal reflection (which is probably only interesting to me), though, is a basketball story (the important story for this forum).  The Pistons in the early 1990s tried to re-build a title team – a title team built on defense –by acquiring scorers (i.e. Mills, Elliott, Houston, and Hunter).  But since these scorers were not very productive, these acquisitions never helped much.

In 2009, the Pistons – now led by Joe Dumars – seemed to make the same mistake.  The title team Dumars built in 2004 didn’t emphasize scorers. But in trying to maintain the contending status of his team, Dumars turned to two free agent scorers (Ben Gordon and Charlie Villanueva).  Because neither is very productive, and furthermore, because many of the players the Pistons employ today are not very productive; the Pistons in 2009-10 are not winning many games.

As a fan of this team I can only hope the outcome of these bad decisions today turn out as well as they did back in the early 1990s.  The disaster that was 1993-94 led to the third choice in the 1994 draft.  And with that pick the Pistons selected Grant Hill.  Led by Hill – a productive scorer — the Pistons were back in the playoffs by 1996.  And although Hill left the Pistons without winning a title, his departure brought to Detroit a young Ben Wallace (a productive non-scorer who did help the Pistons win a title).

Will this scenario play out again?  We don’t know yet.  But like fans of the Lions, followers of the Pistons are already thinking about the 2010 draft and wondering… who does Dickie V. think we should take this time?  Okay, that’s not what we are thinking.   But we are counting down the 162 days until the next draft and checking out sites like NBADraft.net and  Draft Express.

- DJ

The WoW Journal Comments Policy

Our research on the NBA was summarized HERE.

The Technical Notes at wagesofwins.com provides substantially more information on the published research behind Wins Produced and Win Score

Wins Produced, Win Score, and PAWSmin are also discussed in the following posts:

Simple Models of Player Performance

Wins Produced vs. Win Score

What Wins Produced Says and What It Does Not Say

Introducing PAWSmin — and a Defense of Box Score Statistics

Finally, A Guide to Evaluating Models contains useful hints on how to interpret and evaluate statistical models.

Who Besides Ed Stefanski Should be Unhappy in Philadelphia?

After 36 games, Philadelphia’s mark is only 11-25.  Apparently, such a record had made Ed Stefanski – president of the Philadelphia 76ers – unhappy.  And furthermore, he thinks every0ne – including Eddie Jordan (the team’s head coach) – is to blame.

There is a tendency in sports to credit everyone with a team’s success, and blame everyone when the team fails.  But statistics – which can separate a player from his teammates (and perhaps, separate a coach from his players)—give us the ability to assign credit and blame.  And therefore, it’s possible to offer some thoughts on who in Philadelphia should really be unhappy.

The Same Story in Philadelphia

Let’s start with Table One, which reports the Wins Produced for the Sixers thus far this season.

Table One: The Philadelphia 76ers after 36 games in 2009-10

Table One indicates that the Andre Iguodala and Samuel Dalembert are on pace to produce 23.8 wins.  The rest of the roster, though, is only projected to offer 7.3 Wins Produced this season.

For those familiar with the Wins Produced history of the Sixers, this is a very familiar story.  We have seen the following since 2006-07:

  • 2006-07: Iguodala, Dalembert, and Andre Miller produced 27.9 of the team’s 35 wins.
  • 2007-08: Iguodala, Dalembert, and Miller produce 30.4 of the team’s 40 wins.
  • 2008-09: Iguodala, Dalembert, and Miller produce 30.1 of the team’s 41 wins.

As noted in September, such numbers indicate that across the past three years, all players in Philadelphia not named Iguodala, Dalembert, or Miller have produced less than nine wins per season.  In sum, what we have seen the past three seasons is happening again in 2009-10.   

Assigning Blame

Last May the Sixers hired Eddie Jordan.  Stefanski said the following when Jordan was hired“I saw firsthand the immense impact Eddie Jordan had in helping the Nets reach two NBA Finals and as the head coach in Washington he consistently put his teams in a position to win on a nightly basis.  He embodies all the qualities I was looking for in the next head coach of the Sixers and we are very excited to have him in Philadelphia.”

So last May, Stefanski was “very excited” to have Eddie Jordan as his coach.  However, if we read a bit further past the point in the ESPN.com article where Stefanski is “very excited”, we see that it was not clear last May that Andre Miller was going to depart Philadelphia.  And as we now know, Miller was not retained.   Last season Miller produced 11.1 wins for the Sixers.  As noted, the trio of Iguodala, Dalembert, and Miller have produced most of this team’s wins across the past three seasons.  With just Iguodala and Dalembert remaining, the Sixers needed to find someone else to produce wins.

On an NBA team, it’s often a person like Stefanski who is charged with the task of finding “someone else to produce wins.”  In an effort to replace Miller, Stefanski drafted Jrue Holiday (as noted in the past, the Sixers could have had Ty Lawson).  Holiday’s production – as Table One indicates — is currently in the negative range (and Lawson is very much in the positive range). The team also added Allen Iverson, who is currently posting a 0.063 WP48 [Wins Produced per 48 minutes].  Fortunately, Louis Williams has been above average (average WP48 is 0.100).  But even with Williams producing more, Miller’s 11.1 wins from 2008-09 are not fully replaced.

The Sixers actually had to do more than just replace Miller’s production.  For the Sixers to improve on last season – which seemed to be the idea when the team changed coaches — more wins were going to have to be found.  But the only players the Sixers added to last year’s roster (who are actually playing) were Rodney Carney, Jason Kapono, Jason Smith, Holiday, and Iverson.  These five players were not above average performers last season (Smith was below average two years ago) and this year they are combining to produce -3.4 wins. 

Such numbers suggest that the coach is not to blame.  The players the Sixers are employing are – with few exceptions – playing as well as they did in the past.  In fact, Table One indicates that the Sixers are exceeding (by a small margin) what we should expect given past performance.  This suggests that for those wishing to assign blame the focus has to be on the person who picked the players.  And again, that person would be Ed Stefanski.

Now in Stefanski’s defense, Andre Miller is now 33 years old.  So Miller had to be replaced sooner or later.   Furthermore, it’s not clear that Stefanski should have known that Elton Brand – the player leading the team in salary paid — was not going to return to the form we saw before he got hurt with the Clippers.  In other words, had Miller stayed and been productive and Brand returned to form, the Sixers would currently be in the thick of the Eastern Conference playoff picture (not that this would be a great achievement).  But Miller didn’t stay and Brand is simply not the Brand we saw in Los Angeles and Chicago.  Consequently, the Sixers are simply not that good.

So what do the Sixers need to be good?  Obviously they need more productive players. Yes, a coach can alter the productivity of players.  But in general, that doesn’t happen.  Therefore decision-makers – like Stefanski – should primarily focus on giving the coach a better roster. This means drafting better, or in other words, don’t choose players like Holiday over players like Lawson.  It also helps to sign better free agents, or in other words, don’t sign players like Iverson, Kapono, and Carney. 

Until different roster decisions are made, though, Stefanski will probably continue to be unhappy.  And since human nature often leads us to blame others for our problems, the unhappiness of Stefanski will probably lead to more unhappiness for Jordan, the players on the Sixers, and yes, fans of this team.

- DJ

The WoW Journal Comments Policy

Our research on the NBA was summarized HERE.

The Technical Notes at wagesofwins.com provides substantially more information on the published research behind Wins Produced and Win Score

Wins Produced, Win Score, and PAWSmin are also discussed in the following posts:

Simple Models of Player Performance

Wins Produced vs. Win Score

What Wins Produced Says and What It Does Not Say

Introducing PAWSmin — and a Defense of Box Score Statistics

Finally, A Guide to Evaluating Models contains useful hints on how to interpret and evaluate statistical models.