Frequencies for first 10,000 rows of clintype variable in nhamcsopd1997 dataset :

          clinic type |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     General medicine |      4,300       43.00       43.00
              Surgery |      1,690       16.90       59.90
           Pediatrics |      1,283       12.83       72.73
Obstetrics/Gynecology |      1,625       16.25       88.98
      Substance abuse |        110        1.10       90.08
                Other |        992        9.92      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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