Frequencies for first 10,000 rows of region variable in nhamcsopd1992 dataset :

 Geographic |
  region of |
  physician |
     office |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      6,251       62.51       62.51
    Midwest |      2,450       24.50       87.01
      South |        666        6.66       93.67
       West |        633        6.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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