Frequencies for first 10,000 rows of clintype variable in nhamcsopd1995 dataset :

          clinic type |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     General medicine |      4,187       41.87       41.87
              Surgery |      1,800       18.00       59.87
           Pediatrics |      1,352       13.52       73.39
Obstetrics/Gynecology |      1,786       17.86       91.25
      Substance abuse |        161        1.61       92.86
                Other |        714        7.14      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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