On December 14 the Charlotte Bobcats sent Walter Herrmann and Primoz Brezec to the Detroit Pistons for Nazr Mohammed. At that time, none of these players was averaging more than 14 minutes per game for their respective teams. Consequently, this trade didn’t create much of a stir among NBA observers.
At the time of the trade the Bobcats record was 8-12. Mohammed missed the next game (a loss to Orlando). Over the next 20 games, though, Mohammed has averaged nearly 25 minutes a contest and the Bobcats record has been…. okay, 8-12. So clearly this trade hasn’t helped much.
The Bobcats Improve
If we delve into the numbers, though, we see a different story. After 20 games the Bobcats were being outscored by 5.6 points per contest. In seven different games their opponent won by more than 15 points. If we considered points scored and points surrendered, we would have expected the Bobcats to only have won 6.3 of their first 20 games, or 26 wins over a completed season.
Since Mohammed has joined the roster this team is still below average. But with Mohammed in the line-up the team has only been outscored by 1.7 points per game (and only once has the team lost by more than 15 points). If the Bobcats could maintain a -1.7 point differential across a full season it could expect to win about 36 games. In sum, the Bobcats are better after the trade.
Evaluating the Trade
So exactly why are the Bobcats better? Much of the answer can be seen in the numbers of the players involved in the December 14 trade. Table One reports the career averages of Brezec, Herrmann, and Mohammed prior to the 2007-08 season.
Let’s start with the player this column is praising, Nazr Mohammed. He began his career during the lock-out shortened campaign of 1998-99. In Mohammed’s first nine seasons he has demonstrated that he is a slightly above average center. With respect to most statistics he hovers around the average mark, with slightly below average scoring marks offset by an above average performance on the boards.
Although Mohammed is little better than average, he is still quite a bit better than the two players the Bobcats traded away. Brezec began his career in 2001. Across his first six seasons he has shown he can be an above average scorer. But he is deficient with respect to rebounds, steals, and blocked shots. When we look at the total package, via Win Score, we see that Brezec is well below average.
The other player, Herrmann, began his career last year and clearly demonstrated the ability to score efficiently. But his advantage in scoring is offset by a level of rebounding that is well below average for a power forward (his primary position). Herrmann is also below average with respect to blocks and steals. Hence, like Brezec, his Win Score is below par.
Although both Brezec and Herrman were below average entering this season, what they did in Charlotte across the first 20 games of 2007-08 was quite a bit worse.
Table Two indicates across almost all statistical categories these players were below average with Charlotte in 2007-08. In contrast, Mohammed was basically his same average self in Detroit this season. Consequently, this trade allowed the Bobcats to swap two sub-par performers for one average player.
By combining the statistics of Brezec and Herrman, Table Two highlights what this trade gave Charlotte. Together, Brezec and Herrmann were occupying more than 20 minutes per game. When we compare the performance of Brezec-Herrmann to Mohammed, we see the Bobcats came out ahead on everything but free throw percentage.
We can actually go beyond these tables and look at how many wins the Bobcats could have expected had Mohammed played the minutes of Brezec-Herrmann from the start. Brezec-Herrmann combined to post a -0.135 WP48 [Wins Produced per 48 minutes] across the first 20 contests. Meanwhile, Mohammed’s mark in Detroit was 0.124 (quite close to his career mark of 0.123). If the Bobcats had been able to take the 443 minutes allocated to Brezec-Herrmann and given these to Mohammed, the team would have improved by 2.4 wins across the first 20 games. This translates into 9.6 additional wins over an 82 game season. If you go back to the beginning of this column you will see that this mark is quite close to the improvement we see from the Bobcats in the 20 games after this trade.
When the Bobcats defeated the Celtics, Nuggets, and Magic in one week in January, people began to think this team had improved. And people argued that this improvement was tied to the play of Gerald Wallace and Jason Richardson, the leading scorers in Charlotte. Although it’s the case that Wallace and Richardson have played a bit better recently, I think the numbers tell us that it was the Mohammed trade that allowed Charlotte to become a bit more respectable.
More Comments on Charlotte and Detroit
Now it’s important to note that this trade doesn’t solve all of Charlotte’s problems. Yes Mohammed helps at the center position. And he is actually giving this team a level of productivity that surpasses what he did in Detroit (a level I am not sure will continue). But beyond Mohammed, the team is only getting above average performances from Wallace (when he plays small forward), Richardson, and Emeka Okafor. Every other player on the team is below average this season. So we can see this team still has to add a bit more productive talent if it wishes to consistently contend in the Eastern Conference.
What this trade has done for Detroit? Immediately after the trade the Pistons went on an eleven game winning streak. During that entire streak, Herrmann played 18 minutes. Across the last nine games, where the Pistons have gone 3-6, Herrmann has played 52 minutes.
Does this mean that Herrmann is responsible for Detroit’s troubles? No, the real problem can be seen in the recent play of Jason Maxiell, Rasheed Wallace, and Tayshaun Prince. The play of the two rookies, Rodney Stuckey and Aaron Afflalo, hasn’t helped much either. And I would add that Herrmann and Brezec have also struggled in Detroit just as they did in Charlotte.
In sum, the Mohammed trade hasn’t helped Detroit. But I think the team’s recent troubles can’t really be linked to Herrmann and Brezec. Again, these players are not part of the solution. But, they are not the problem in Detroit either.
Our research on the NBA was summarized HERE.
Wins Produced, Win Score, and PAWSmin are also discussed in the following posts:
Finally, A Guide to Evaluating Models contains useful hints on how to interpret and evaluate statistical models.