Frequencies for first 10,000 rows of contsub8 variable in namcs2009 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         10        0.10        0.10
              schedule iii |         12        0.12        0.22
               schedule iv |         35        0.35        0.57
                schedule v |          9        0.09        0.66
                no control |        821        8.21        8.87
              undetermined |         16        0.16        9.03
        multiple schedules |          1        0.01        9.04
                         . |      9,096       90.96      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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