Frequencies for first 10,000 rows of contsub1 variable in nhamcsed2005 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        668        6.68        6.68
              schedule iii |        580        5.80       12.48
               schedule iv |        278        2.78       15.26
                schedule v |         19        0.19       15.45
                no control |      6,051       60.51       75.96
              undetermined |        140        1.40       77.36
                         . |      2,264       22.64      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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