Frequencies for first 10,000 rows of contsub4 variable in nhamcsopd2005 dataset :

controlled status code for |
                    med #4 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         31        0.31        0.31
              schedule iii |         18        0.18        0.49
               schedule iv |         68        0.68        1.17
                schedule v |          3        0.03        1.20
                no control |      1,578       15.78       16.98
              undetermined |         34        0.34       17.32
                         . |      8,268       82.68      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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