Frequencies for first 10,000 rows of rx1v2c4 variable in namcs2011 dataset :

   For RX1, |
 level 2 of |
MULTUM drug |
category #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,957       99.57       99.57
        066 |         40        0.40       99.97
        104 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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