Marginal Win Score correlation numbers

In an attempt to test the legitimacy of this Marginal Win Score metric I use to allocate professional basketball wins and losses, I have been calculating its correlation coefficient versus a number of variables.

1. How well do a player’s Marginal Win Score from last season explain his Marginal Win Score this season?

Correlation: .68

r2: 45%

Sample Size: 299 players from the 2010-11 season who also played in the 2009-10 season, and 179 players from the 2009-10 season who played in the 2008-09 season.

2. How well do Marginal Win Score wins and losses correlate with actual wins?

Correlation: .971

r2: 94%

Sample Size:  All NBA teams for seasons: 2010-11, 2009-10

3. How well do Marginal Win Score wins and losses correlate with Pythagorean wins and losses ?

Correlation: .988

r2: 98%

Sample Size:  All NBA teams for 2010-11 season and 2009-10 season.

4. How well does the Marginal Win Score of an NBA player who changes teams in the off-season correlate with his Marginal Win Score in the previous season with his old team?

Correlation: .61

r2:  37%  

Sample Size: 70 players who changed teams between 2009-10 and 2010-11 seasons. 

5. How well does a rookie Marginal Win Score explain a sophomore Marginal Win Score?

Correlation: .48

r2: 23%

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