Frequencies for first 10,000 rows of rx4v2c2 variable in nhamcsed2006 dataset :

        for rx4, level 2 of multum drug |
                            category #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
  anti-infectives: antimalarial agents  |          6        0.06        0.06
anti-infectives: miscellaneous antibiot |         11        0.11        0.17
          anti-infectives: sulfanomides |          4        0.04        0.21
    cardiovascular agents: vasodilators |         15        0.15        0.36
    cardiovascular agents: vasopressors |          2        0.02        0.38
                   cns: anticonvulsants |         31        0.31        0.69
cns: antiemetic/antivertigo agents: 5ht |         55        0.55        1.24
coagulation modifiers: antiplatelet age |          7        0.07        1.31
miscellaneous agents: local injectable  |         14        0.14        1.45
nutritional products: minerals and elec |          4        0.04        1.49
     respiratory agents: antihistamines |         19        0.19        1.68
       respiratory agents: antitussives |          9        0.09        1.77
respiratory agents: miscellaneous respi |         23        0.23        2.00
  topical agents: dermatological agents |          6        0.06        2.06
   miscellaneous agents: antirheumatics |          1        0.01        2.07
psychotherapeutic agents: antipsychotic |          5        0.05        2.12
                                      . |      9,788       97.88      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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