Frequencies for first 10,000 rows of rx4v1c4 variable in namcs2011 dataset :

   For RX4, |
 level 1 of |
MULTUM drug |
category #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,989       99.89       99.89
        057 |          8        0.08       99.97
        254 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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