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

       type of clinic |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     General medicine |      4,238       42.38       42.38
              Surgery |      1,603       16.03       58.41
           Pediatrics |      1,140       11.40       69.81
Obstetrics/Gynecology |      1,762       17.62       87.43
                Other |         81        0.81       88.24
      Substance Abuse |      1,176       11.76      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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