Frequencies for first 10,000 rows of clintype variable in nhamcsopd2007 dataset :

          clinic type |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     general medicine |      3,366       33.66       33.66
              surgery |      1,576       15.76       49.42
           pediatrics |      1,422       14.22       63.64
obstetrics/gynecology |      1,372       13.72       77.36
      substance abuse |        264        2.64       80.00
                other |      2,000       20.00      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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