Frequencies for first 10,000 rows of region variable in nhamcsopd1993 dataset :

 geographic |
  region of |
  physician |
     office |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      5,623       56.23       56.23
    Midwest |      3,569       35.69       91.92
      South |        808        8.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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