Nate Robinson is twice the player Eddie is.
Has he been twice the player with the Celts, though?
Here are their stats, per 36 minutes, with the Celts this season:
House: 15.2 pts, 2.0 ast, 2.9 reb, 1.2 stl, 1.1 tov, .500 eFG%
Nate: 16.0 pts, 3.6 ast, 3.6 reb, 2.1 stl, 1.9 tov, .516 eFG%
Nate has been a very slight upgrade statistically. The question is, was that minor upgrade worth the extra money and Bill Walker?
Also, even though individually House's production has been lower, the team has played better with him on the floor than with Nate:
Team's production with House:
107.5 pts scored per 100 possessions
104.1 pts allowed per 100 possessions
Team's production with Nate:
103.7 pts scored per 100 possessions
110.5 pts allowed per 100 possessions
For whatever reason, then, the team has scored a lot more with Eddie, and given up a lot fewer points. Eddie's +3.4 point differential is world's better than Nate's -6.8.
Of course, it's a fairly moot point, since Nate isn't in the playoff rotation. Until he's contributing consistently in the playoffs, there's really no way to say that the trade paid off.