Here's how Win Contribution translates into wins.
You take a team's cumulative Win Contribution (which is the sum of each player's Position Adjusted Win Score per 48 minutes x each player's percentage of overall playing time).
For example, at the end of the 2006-07 season, the Milwaukee Bucks cumulative WC was
-0.959. Here's how it translates:
1. You take that number, -0.959, and divide it by 48.
2. Then you take the resulting number and multiply it by 1.621.
3. Then you take that number and add 0.104.
4. Then you take that number and divide it again by 48.
5. Then you multiply that number by the total number of player minutes (games played x 48 x 5). At the end of the season, that is around 19680.
If you do that calculation for the 2006-07 Bucks, you come up with 29.63, which is very close to their actual victory total: 28.