Frequencies for first 10,000 rows of rx5v2c2 variable in nhamcsed2006 dataset :

        for rx5, level 2 of multum drug |
                            category #2 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
  anti-infectives: antimalarial agents  |          3        0.03        0.03
anti-infectives: miscellaneous antibiot |          4        0.04        0.07
          anti-infectives: sulfanomides |          3        0.03        0.10
    cardiovascular agents: vasodilators |          6        0.06        0.16
    cardiovascular agents: vasopressors |          2        0.02        0.18
                   cns: anticonvulsants |          9        0.09        0.27
cns: antiemetic/antivertigo agents: 5ht |         25        0.25        0.52
            cns: anti-parkinson agents  |          1        0.01        0.53
coagulation modifiers: antiplatelet age |         11        0.11        0.64
    hormones: adrenal cortical steroids |          1        0.01        0.65
miscellaneous agents: local injectable  |          6        0.06        0.71
nutritional products: minerals and elec |          2        0.02        0.73
     respiratory agents: antihistamines |          8        0.08        0.81
       respiratory agents: antitussives |          7        0.07        0.88
respiratory agents: miscellaneous respi |         18        0.18        1.06
psychotherapeutic agents: antipsychotic |          3        0.03        1.09
                                      . |      9,891       98.91      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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