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

       type of clinic |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     General medicine |      4,397       43.97       43.97
              Surgery |      1,440       14.40       58.37
           Pediatrics |      1,895       18.95       77.32
Obstetrics/Gynecology |      1,349       13.49       90.81
                Other |        919        9.19      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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