Frequencies for first 10,000 rows of contsub6 variable in nhamcsopd2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         51        0.51        0.51
              schedule iii |         18        0.18        0.69
               schedule iv |         65        0.65        1.34
                schedule v |          3        0.03        1.37
                no control |      1,662       16.62       17.99
              undetermined |         25        0.25       18.24
        multiple schedules |          2        0.02       18.26
                         . |      8,174       81.74      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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