Frequencies for first 10,000 rows of rx4cat3 variable in nhamcsopd2006 dataset :

     for rx4, multum drug category #3 - |
                               detailed |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
Respiratory agents: bronchodilators: ad |          1        0.01        0.01
     Hormones: sex hormones: progestins |          1        0.01        0.02
CNS: Antiemetic/antivertigo agents: ant |          4        0.04        0.06
Miscellaneous agents: genitourinary tra |          2        0.02        0.08
   Miscellaneous agents: antipsoriatics |          5        0.05        0.13
                                      . |      9,987       99.87      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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