Frequencies for first 10,000 rows of med28 variable in nhamcsed2014 dataset :

                          Medication 28 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                          NO ENTRY MADE |      9,997       99.97       99.97
                               DULCOLAX |          1        0.01       99.98
                                  K-TAB |          1        0.01       99.99
                                SENOKOT |          1        0.01      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017