Frequencies for first 10,000 rows of clintype variable in nhamcsopd1998 dataset :

          clinic type |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     General medicine |      4,768       47.68       47.68
              Surgery |      1,136       11.36       59.04
           Pediatrics |      1,539       15.39       74.43
Obstetrics/Gynecology |      1,584       15.84       90.27
      Substance abuse |         32        0.32       90.59
                Other |        941        9.41      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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