Frequencies for first 10,000 rows of contsub1 variable in namcs2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        235        2.35        2.35
              schedule iii |        163        1.63        3.98
               schedule iv |        246        2.46        6.44
                schedule v |         21        0.21        6.65
                no control |      7,092       70.92       77.57
              undetermined |        162        1.62       79.19
        multiple schedules |         11        0.11       79.30
                         . |      2,070       20.70      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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