Frequencies for first 10,000 rows of contsub3 variable in nhamcsopd2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        106        1.06        1.06
              schedule iii |         45        0.45        1.51
               schedule iv |        171        1.71        3.22
                schedule v |         13        0.13        3.35
                no control |      3,426       34.26       37.61
              undetermined |         55        0.55       38.16
        multiple schedules |         13        0.13       38.29
                         . |      6,171       61.71      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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