See Strength of Schedule for an explanation. There are three sos calculations:
the 1st averages the opponents computer rating based on
 computer margin of victory "Reg In" and "ROM", the 2nd
 is similar to the first but instead of a simple average, it
 weighs games against stronger teams more heavily, and
 the 3rd is based on the RPI SOS formula used by the NCAA. This factor is not used in the power rating calculation.
          
      
   
     
   
           
           

Congratulations to Gonzaga - 2011 WCAC Champions, Calverton School - 2011 MILL Champions, Potomac School - 2011 MAC Champions and Worcester Prep 2011 ESIAC Champions
     
  
  
   
Rank Team                    Total  SOS Ave   SOS Wt Ave  SOS RPI    W  L  T
                             Games Rnk Value  Rnk Value  Rnk Value
 
   1 DeMatha                   18   1  91.73   1  82.06   2   0.59   7 11  0
   2 Gonzaga                   22   2  90.63   2  79.60   8   0.56  19  3  0
   3 Middleburg Academy        19   3  90.12   3  78.54   3   0.59  10  9  0
   4 Our Lady-Good Counsel     18   4  90.07   4  78.39   1   0.60  13  5  0
   5 Bishop O'Connell          19   5  89.90   5  77.83   5   0.58   4 15  0
   6 St Marys Ryken            19   6  89.43   6  76.83   7   0.57  15  4  0
   7 Paul VI                   21   7  88.35   7  74.87   4   0.58  15  6  0
   8 St Johns DC               20   8  88.29   8  74.53   9   0.55  10 10  0
   9 Bishop Ireton             19   9  86.59   9  72.19  11   0.53   3 16  0
  10 Potomac School            17  10  86.29  12  70.35  13   0.51  10  7  0
  11 Flint Hill                17  11  86.22  10  70.47  17   0.48   9  8  0
  12 Calverton                 15  12  85.82  11  70.43  12   0.52  11  4  0
  13 The Heights               16  13  83.40  13  65.43  19   0.47  10  6  0
  14 Sidwell Friends           15  14  83.28  14  64.49  16   0.49   5 10  0
  15 St James                  19  15  82.60  15  62.93  15   0.49  12  7  0
  16 Rockbridge Academy         5  16  82.08  17  61.85  10   0.54   0  5  0
  17 Worcester Prep            17  17  81.65  16  62.49  23   0.45  14  3  0
  18 Bishop McNamara           15  18  80.75  18  61.27  26   0.42   2 13  0
  19 Sandy Spring Friends      10  19  80.39  19  59.79  27   0.42   1  9  0
  20 Georgetown Day            11  20  79.42  20  56.85  14   0.49   4  7  0
  21 St Andrews Episcopal      11  21  77.87  23  54.52  18   0.48   3  8  0
  22 Eleanor Roosevelt         12  22  77.74  21  55.03  29   0.41   5  7  0
  23 Gunston Day               17  23  77.28  22  54.93  28   0.41  10  7  0
  24 Maret                     13  24  76.82  24  52.66  20   0.46   8  5  0
  25 St. Maria Goretti          5  25  76.35  25  51.56  33   0.00   0  5  0
  26 West Nottingham            7  26  76.12  26  51.05   6   0.58   0  7  0
  27 Salisbury                 13  27  74.86  27  50.18  21   0.45   3 10  0
  28 Cristo Rey Jesuit          7  28  74.57  28  49.04  22   0.45   0  7  0
  29 Archbishop Carroll         4  29  72.57  29  45.16  30   0.23   0  4  0
  30 Gerstell Academy          11  30  70.14  30  42.57  25   0.43   8  3  0
  31 FCA Lacrosse               7  31  69.01  31  40.34  24   0.45   6  1  0
  32 McLean School              1  32  62.03  32  30.31  31   0.14   0  1  0
  33 Jemicy School              0   0   0.00   0   0.00   0   0.00   0  0  0