Frequencies for first 10,000 rows of rx3v2c3 variable in nhamcsed2006 dataset :

        for rx3, level 2 of multum drug |
                            category #3 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
cns: antiemetic/antivertigo agents: 5ht |         43        0.43        0.43
miscellaneous agents: genitourinary tra |          2        0.02        0.45
    respiratory agents: bronchodilators |          7        0.07        0.52
                                      . |      9,948       99.48      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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