Frequencies for first 10,000 rows of rx7cat3 variable in nhamcsopd2006 dataset :

     for rx7, multum drug category #3 - |
                               detailed |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
     Hormones: sex hormones: progestins |          2        0.02        0.02
CNS: Antiemetic/antivertigo agents: ant |          1        0.01        0.03
Miscellaneous agents: genitourinary tra |          1        0.01        0.04
                                      . |      9,996       99.96      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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