Tuesday, January 22, 2013

Let's Throw out the RPI Rankings for Men's College Basketball



OK, here’s my 2013 bash of the RPI rankings.

Belmont #24/Oregon #25

Belmont (#24)
15-4 (6-0), 1st Ohio Valley – East
                Fri, Nov 9             at Lipscomb                        W 89-60                --             --             --
               Tue, Nov 13        Maryville (Mo.)                 W 88-49                --             --             --
               Sun, Nov 18        at Stanford                         W 70-62                --             --             --
               Wed, Nov 21      at Alaska                              W 74-60                --             --             --
               Fri, Nov 23           Northeastern                    L 71-74                 --             --             --
               Sat, Nov 24         at Oral Roberts                 W 70-67                --             --             --
               Sat, Dec 1            at VCU                                 L 65-75                 --             --             --
               Tue, Dec 4           Lipscomb                             W 100-66             --             --             --
               Thu, Dec 13         Middle Tenn. St.               W 64-49                --             --             --
               Sat, Dec 15          at (9) Kansas                      L 60-89                 --             --             --
               Wed, Dec 19       South Dakota St.              W 76-49                --             --             --
               Fri, Dec 28           at Boston U.                       W 64-48                --             --             --
               Sat, Dec 29          at UCF                                   L 63-66                 --             --             --
               Thu, Jan 3            at Jacksonville St.             W 73-62                --             --             --
               Sat, Jan 5             at Tennessee Tech          W 83-52                --             --             --
               Thu, Jan 10          SE Missouri St.                   W 107-72             --             --             --
               Sat, Jan 12           Tenn-Martin                      W 90-53                --             --             --
               Thu, Jan 17          Eastern Kentucky             W 83-76                --             --             --
               Sat, Jan 19           Tennessee St.                   W 78-66                --             --             --

That’s one game against an AP Top 25 team (lost to Kansas by 29) The only impressive win was at Stanford (11-7, 2-3 in Pac-12). Other Losses against Northeastern, VCU and UCF.

Oregon (#25)
16-2 (5-0), 1st Pac-12
Sat, Nov 10         Northern Arizona             W 83-73                --             --             --
               Mon, Nov 12      Portland St.                        W 80-69                --             --             --
               Fri, Nov 16           Vanderbilt                           W 74-48                --             --             --
               Mon, Nov 19      Jacksonville St.                 W 67-45                --             --             --
               Fri, Nov 23           at (18) UNLV                      W 83-79                --             --             --
               Sat, Nov 24         (22) Cincinnati                   L 66-77                 --             --             --
               Thu, Nov 29        UTSA                                     W 95-78                --             --             --
               Sat, Dec 1            AR Pine Bluff                      W 80-59                --             --             --
               Sat, Dec 8            Idaho St.                              W 87-35                --             --             --
               Sat, Dec 15          Nebraska                             W 60-38                --             --             --
               Wed, Dec 19       at UTEP                                L 84-91                 --             --             --
               Sat, Dec 22          Houston Baptist                W 91-50                --             --             --
               Mon, Dec 31       Nevada                                W 56-43                --             --             --
               Sun, Jan 6            at Oregon St.                     W 79-66                --             --             --
               Thu, Jan 10          (4) Arizona                          W 70-66                --             --             --
               Sun, Jan 13          Arizona St.                          W 68-65                --             --             --
               Thu, Jan 17          at USC                                   W 76-74                --             --             --
               Sat, Jan 19           at (24) UCLA                       W 76-67                --             --             --

That’s 3 wins and one loss against AP Top 25 teams at the time the game was played. Cincinnati and UNLV have since dropped out of the AP poll (both are in the Top 30). UCLA will also drop out after the Oregon loss last weekend. One “bad” loss for Oregon in OT at UTEP (10-7, 3-1 in Conference USA), so not that bad.

Both teams beat Jacksonville St. – Oregon by 22 at home, Belmont by 11 on the road.

To me there’s no comparison between these two teams – with Oregon having the seemingly tougher schedule and better quality wins, and yet Belmont is ranked HIGHER than Oregon in the RPI, updated yesterday, Jan. 20. In fact, that RPI shows Belmont having a much higher Strength of Schedule than Oregon:

Rank      Team     Record Pts          SoS Rank             v RPI 1-50            v RPI 51-100        v RPI 101-150     v RPI 151-200     v RPI 200+

24.              Belmont           15 - 4     0.6264   38           1 - 2        4 - 0        1 - 2        2 - 0        5 - 0
25.              Oregon             16 - 2     0.6246   81           3 - 1        2 - 1        2 - 0        3 - 0        6 – 0

So, both teams are 5-2 against the RPI Top 100, but Oregon has beaten the higher ranked teams. Oregon has no other losses, while Belmont has 2 losses against RPI 101-150.

It seems like the RPI ranking is based on their Strength of Schedule calculation with little or no regard for actual performance. 

To understand the RPI Rankings and how they work, this breakdown is necessary:

Parameter% of
Rating
Team Winning %25 %
Opponent's
Winning %
50 %
Opponent's
Opponent's
Winning %
25 %

That means that only 25% of a team's RPI score is determined by how that team actually performed. There's also no difference for winning by 1, or winning by 30.


Too bad this is used in factoring who gets into the big dance at the end of the season. Since this is the case, shouldn’t the RPI count the wins against Other NCAA tournament quality teams (i.e. RPI Top 50) as more meaningful than the rest of the schedule? 
 

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