Frequencies for first 10,000 rows of rx8v1c1 variable in nhamcsed2006 dataset :

   for rx8, level 1 of multum |
             drug category #1 |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
              anti-infectives |          7        0.07        0.07
              antineoplastics |          1        0.01        0.08
        cardiovascular agents |          4        0.04        0.12
central nervous system agents |          9        0.09        0.21
        coagulation modifiers |          2        0.02        0.23
      gastrointestinal agents |          1        0.01        0.24
                     hormones |          2        0.02        0.26
         miscellaneous agents |          2        0.02        0.28
         nutritional products |          5        0.05        0.33
           respiratory agents |          2        0.02        0.35
               topical agents |          2        0.02        0.37
     psychotherapeutic agents |          1        0.01        0.38
         immunological agents |          1        0.01        0.39
             metabolic agents |          6        0.06        0.45
                            . |      9,955       99.55      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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