Frequencies for first 10,000 rows of region variable in nhamcsopd1994 dataset :

 geographic |
  region of |
  physician |
     office |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      5,568       55.68       55.68
    Midwest |      3,614       36.14       91.82
      South |        818        8.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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