Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2005 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        216        2.16        2.16
              schedule iii |        196        1.96        4.12
               schedule iv |         86        0.86        4.98
                schedule v |          9        0.09        5.07
                no control |      2,100       21.00       26.07
              undetermined |         76        0.76       26.83
                         . |      7,317       73.17      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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