Frequencies for first 10,000 rows of contsub8 variable in namcs2008 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |          6        0.06        0.06
              schedule iii |          6        0.06        0.12
               schedule iv |         35        0.35        0.47
                schedule v |          5        0.05        0.52
                no control |        721        7.21        7.73
              undetermined |          7        0.07        7.80
        multiple schedules |          2        0.02        7.82
                         . |      9,218       92.18      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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