Frequencies for first 10,000 rows of contsub1 variable in nhamcsopd2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        322        3.22        3.22
              schedule iii |        137        1.37        4.59
               schedule iv |        247        2.47        7.06
                schedule v |         17        0.17        7.23
                no control |      6,257       62.57       69.80
              undetermined |        129        1.29       71.09
        multiple schedules |         17        0.17       71.26
                         . |      2,874       28.74      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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