Frequencies for first 10,000 rows of contsub4 variable in nhamcsed2010 dataset :

    Controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        175        1.75        1.75
              schedule iii |        116        1.16        2.91
               schedule iv |         57        0.57        3.48
                schedule v |         12        0.12        3.60
                no control |      1,530       15.30       18.90
              undetermined |         17        0.17       19.07
        multiple schedules |         18        0.18       19.25
                         . |      8,075       80.75      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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