was tweeting back and forward with Alex Rucker a bit today. Thought I would share the exchange.

Alex Rucker ‏@Alex_Rucker
There is almost nothing about a player's on-ball or help defense that you can glean from the box score.

Timothy Hedden ‏@trhedden
@Alex_Rucker doesn't blocked shots point towards good help defense?

Alex Rucker ‏@Alex_Rucker
@trhedden Yes, it absolutely suggests that. But there are plenty of players who get blocks and are very poor help defenders, esp in the post

Naveed ‏@NaveedDawg
@Alex_Rucker Are there better publicly available stats for this? http://82games.com has opponent PER, JJ was ok, anything else?

Alex Rucker ‏@Alex_Rucker
@NaveedDawg No...public stats are based on data which does not support accurate defensive analysis.


Timothy Hedden ‏@trhedden
@Alex_Rucker what do you look at then in order to evaluate great defenders? Points against, +/-


Alex Rucker ‏@Alex_Rucker
@trhedden None of the above. We have orders of magnitude more data than the public sphere.