Frequencies for first 10,000 rows of rx5v1c1 variable in nhamcsopd2006 dataset :

   for rx5, level 1 of multum |
             drug category #1 |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
              Anti-infectives |         59        0.59        0.59
              Antineoplastics |         20        0.20        0.79
                  Biologicals |          3        0.03        0.82
        Cardiovascular agents |        280        2.80        3.62
Central nervous system agents |        318        3.18        6.80
        Coagulation modifiers |         20        0.20        7.00
      Gastrointestinal agents |        110        1.10        8.10
                     Hormones |         75        0.75        8.85
         Miscellaneous agents |         44        0.44        9.29
         Nutritional products |        106        1.06       10.35
           Respiratory agents |         87        0.87       11.22
               Topical agents |         53        0.53       11.75
        Alternative medicines |         17        0.17       11.92
     Psychotherapeutic agents |         82        0.82       12.74
         Immunological agents |         26        0.26       13.00
             Metabolic agents |        142        1.42       14.42
                            . |      8,558       85.58      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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