Frequencies for first 10,000 rows of ncmed4 variable in nhamcsopd2005 dataset :

      was medication 4 new or |
                   continued? |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
                          new |        411        4.11        4.11
                    continued |      1,264       12.64       16.75
               not applicable |      8,268       82.68       99.43
                        blank |         57        0.57      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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