Frequencies for first 10,000 rows of contsub8 variable in nhamcsed2010 dataset :

    Controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |          8        0.08        0.08
              schedule iii |          8        0.08        0.16
               schedule iv |         12        0.12        0.28
                no control |        135        1.35        1.63
              undetermined |          4        0.04        1.67
                         . |      9,833       98.33      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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