Frequencies for first 10,000 rows of ncmed4 variable in nhamcsopd2006 dataset :

      was medication 4 new or |
                   continued? |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
                          New |        318        3.18        3.18
                    Continued |      1,589       15.89       19.07
               Not applicable |      7,980       79.80       98.87
                        Blank |        113        1.13      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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