Frequencies for first 10,000 rows of divisionoff variable in namcs2012 dataset :

   Census division |
 where majority of |
       physician's |
    sampled visits |
          occurred |      Freq.     Percent        Cum.
-------------------+-----------------------------------
   Middle Atlantic |      1,579       15.79       15.79
East North Central |      1,933       19.33       35.12
West North Central |         38        0.38       35.50
    South Atlantic |      1,714       17.14       52.64
West South Central |      2,523       25.23       77.87
           Pacific |      2,213       22.13      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016