Frequencies for first 10,000 rows of contsub7 variable in nhamcsed2005 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |          9        0.09        0.09
              schedule iii |          8        0.08        0.17
               schedule iv |          5        0.05        0.22
                schedule v |          1        0.01        0.23
                no control |        169        1.69        1.92
              undetermined |          3        0.03        1.95
                         . |      9,805       98.05      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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