Frequencies for first 10,000 rows of contsub2 variable in nhamcsed2010 dataset :

    Controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        512        5.12        5.12
              schedule iii |        333        3.33        8.45
               schedule iv |        162        1.62       10.07
                schedule v |         12        0.12       10.19
                no control |      4,350       43.50       53.69
              undetermined |         40        0.40       54.09
        multiple schedules |         49        0.49       54.58
                         . |      4,542       45.42      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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