Frequencies for first 10,000 rows of contsub4 variable in nhamcsed2005 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        115        1.15        1.15
              schedule iii |         94        0.94        2.09
               schedule iv |         37        0.37        2.46
                schedule v |          3        0.03        2.49
                no control |      1,153       11.53       14.02
              undetermined |         39        0.39       14.41
                         . |      8,559       85.59      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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