Frequencies for first 10,000 rows of contsub6 variable in namcs2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         17        0.17        0.17
              schedule iii |         22        0.22        0.39
               schedule iv |         65        0.65        1.04
                schedule v |          7        0.07        1.11
                no control |      1,401       14.01       15.12
              undetermined |         14        0.14       15.26
        multiple schedules |          5        0.05       15.31
                         . |      8,469       84.69      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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