Frequencies for first 10,000 rows of contsub8 variable in nhamcsed2005 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |          7        0.07        0.07
              schedule iii |          4        0.04        0.11
               schedule iv |         12        0.12        0.23
                no control |         99        0.99        1.22
              undetermined |          2        0.02        1.24
                         . |      9,876       98.76      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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