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

          Clinic type |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     General medicine |      4,240       42.40       42.40
              Surgery |      1,778       17.78       60.18
           Pediatrics |      1,239       12.39       72.57
Obstetrics/Gynecology |      1,413       14.13       86.70
                Other |      1,255       12.55       99.25
      Substance Abuse |         75        0.75      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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