Frequencies for first 10,000 rows of rx8v1c2 variable in nhamcsed2006 dataset :

   for rx8, level 1 of multum |
             drug category #2 |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
              anti-infectives |          1        0.01        0.01
        coagulation modifiers |          2        0.02        0.03
                     hormones |          1        0.01        0.04
               topical agents |          1        0.01        0.05
                            . |      9,995       99.95      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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