Frequencies for first 10,000 rows of rx2v2c2 variable in nhamcsed2006 dataset :

        for rx2, level 2 of multum drug |
                            category #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
  anti-infectives: antimalarial agents  |         16        0.16        0.16
anti-infectives: miscellaneous antibiot |         16        0.16        0.32
          anti-infectives: sulfanomides |         41        0.41        0.73
       cardiovascular agents: diuretics |          4        0.04        0.77
    cardiovascular agents: vasodilators |         68        0.68        1.45
    cardiovascular agents: vasopressors |          1        0.01        1.46
                        cns: analgesics |          1        0.01        1.47
                   cns: anticonvulsants |         92        0.92        2.39
cns: antiemetic/antivertigo agents: 5ht |        299        2.99        5.38
            cns: anti-parkinson agents  |          1        0.01        5.39
coagulation modifiers: antiplatelet age |         53        0.53        5.92
    hormones: adrenal cortical steroids |          6        0.06        5.98
        miscellaneous agents: antidotes |          2        0.02        6.00
miscellaneous agents: local injectable  |         49        0.49        6.49
nutritional products: minerals and elec |         11        0.11        6.60
     respiratory agents: antihistamines |         98        0.98        7.58
       respiratory agents: antitussives |         22        0.22        7.80
    respiratory agents: bronchodilators |          1        0.01        7.81
      respiratory agents: decongestants |          7        0.07        7.88
respiratory agents: miscellaneous respi |         94        0.94        8.82
respiratory agents: respiratory inhalan |          1        0.01        8.83
  topical agents: dermatological agents |         20        0.20        9.03
  topical agents: mouth and throat prod |          3        0.03        9.06
    topical agents: vaginal preprations |          4        0.04        9.10
psychotherapeutic agents: antipsychotic |         16        0.16        9.26
metabolic agents: antihyperuricemic age |          1        0.01        9.27
                                      . |      9,073       90.73      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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