Frequencies for first 10,000 rows of contsub2 variable in nhamcsed2005 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        391        3.91        3.91
              schedule iii |        347        3.47        7.38
               schedule iv |        164        1.64        9.02
                schedule v |         19        0.19        9.21
                no control |      4,047       40.47       49.68
              undetermined |        101        1.01       50.69
                         . |      4,931       49.31      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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