Frequencies for first 10,000 rows of ncmed3 variable in nhamcsopd2006 dataset :

      was medication 3 new or |
                   continued? |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
                          New |        630        6.30        6.30
                    Continued |      2,160       21.60       27.90
               Not applicable |      7,059       70.59       98.49
                        Blank |        151        1.51      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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