Frequencies for first 10,000 rows of clintype variable in nhamcsopd1999 dataset :

          clinic type |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     General medicine |      4,328       43.28       43.28
              Surgery |      1,586       15.86       59.14
           Pediatrics |      1,541       15.41       74.55
Obstetrics/Gynecology |      1,445       14.45       89.00
                Other |      1,100       11.00      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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