Frequencies for first 10,000 rows of regionoff variable in namcs2015 dataset :

     Region |
      where |
majority of |
physician's |
    sampled |
     visits |
   occurred |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,285       22.85       22.85
          2 |      3,635       36.35       59.20
          3 |      2,421       24.21       83.41
          4 |      1,659       16.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017