Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2010 dataset :

    Controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        301        3.01        3.01
              schedule iii |        214        2.14        5.15
               schedule iv |        106        1.06        6.21
                schedule v |          6        0.06        6.27
                no control |      2,701       27.01       33.28
              undetermined |         27        0.27       33.55
        multiple schedules |         24        0.24       33.79
                         . |      6,621       66.21      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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