Frequencies for first 10,000 rows of contsub4 variable in nhamcsopd2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         72        0.72        0.72
              schedule iii |         38        0.38        1.10
               schedule iv |        116        1.16        2.26
                schedule v |          9        0.09        2.35
                no control |      2,620       26.20       28.55
              undetermined |         38        0.38       28.93
        multiple schedules |          9        0.09       29.02
                         . |      7,098       70.98      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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