Frequencies for first 10,000 rows of contsub5 variable in nhamcsopd2005 dataset :

controlled status code for |
                    med #5 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         13        0.13        0.13
              schedule iii |         17        0.17        0.30
               schedule iv |         51        0.51        0.81
                no control |      1,092       10.92       11.73
              undetermined |         16        0.16       11.89
                         . |      8,811       88.11      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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