Frequencies for first 10,000 rows of contsub2 variable in nhamcsopd2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        186        1.86        1.86
              schedule iii |         88        0.88        2.74
               schedule iv |        286        2.86        5.60
                schedule v |         16        0.16        5.76
                no control |      4,500       45.00       50.76
              undetermined |        105        1.05       51.81
        multiple schedules |         16        0.16       51.97
                         . |      4,803       48.03      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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