Frequencies for first 10,000 rows of contsub2 variable in nhamcsopd2005 dataset :

controlled status code for |
                    med #2 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        100        1.00        1.00
              schedule iii |         83        0.83        1.83
               schedule iv |        155        1.55        3.38
                schedule v |         18        0.18        3.56
                no control |      3,709       37.09       40.65
              undetermined |        134        1.34       41.99
                         . |      5,801       58.01      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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