Frequencies for first 10,000 rows of clintype variable in nhamcsopd2001 dataset :

    type of |
     clinic |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,207       32.07       32.07
          2 |      1,997       19.97       52.04
          3 |      1,774       17.74       69.78
          4 |      1,683       16.83       86.61
          5 |         93        0.93       87.54
          6 |      1,246       12.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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