Frequencies for first 10,000 rows of contsub1 variable in nhamcsopd2005 dataset :

controlled status code for |
                    med #1 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        278        2.78        2.78
              schedule iii |        159        1.59        4.37
               schedule iv |        149        1.49        5.86
                schedule v |          8        0.08        5.94
                no control |      5,871       58.71       64.65
              undetermined |        239        2.39       67.04
                         . |      3,296       32.96      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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