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 Georgetown Prep - 2011 IAC Champions and Gilman - 2011 MIAA A Champions
     
  
  
   
Rank Team                    Total  SOS Ave   SOS Wt Ave  SOS RPI    W  L  T
                             Games Rnk Value  Rnk Value  Rnk Value
 
   1 St Paul's                 21   1  97.64   1  94.32   1   0.56  13  8  0
   2 Loyola-Blakefield         18   2  97.57   2  94.15   5   0.53   8 10  0
   3 Calvert Hall              19   3  97.30   3  93.50   3   0.53  17  2  0
   4 Archbishop Spalding       16   4  97.07   4  93.02   7   0.50   3 13  0
   5 Gilman                    18   5  96.97   5  92.77   6   0.52  13  5  0
   6 Boys' Latin               19   6  96.92   6  92.66  10   0.49  11  8  0
   7 McDonogh                  19   7  96.92   7  92.61   4   0.53  15  4  0
   8 Severn                    22   8  96.69   8  92.10   2   0.54  10 12  0
   9 St Mary's Annapolis       18   9  96.57   9  91.88   8   0.49  12  6  0
  10 Georgetown Prep           21  10  96.57  10  91.77  11   0.48  18  3  0
  11 Landon                    22  11  96.18  11  90.90   9   0.49  19  3  0
  12 Mount St Joseph           17  12  95.90  12  90.43  12   0.47   3 14  0
  13 Bullis                    19  13  94.87  13  87.95  14   0.46  13  6  0
  14 St Stephen/St Agnes       20  14  94.54  14  87.34  16   0.43  11  9  0
  15 St Albans                 22  15  93.07  15  84.10  13   0.47   9 13  0
  16 Episcopal HS              26  16  92.35  16  82.68  15   0.44  21  5  0