Frequencies for first 10,000 rows of rx1v2c4 variable in namcs2012 dataset :

   For RX1, |
 level 2 of |
MULTUM drug |
category #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,980       99.80       99.80
        066 |         11        0.11       99.91
        104 |          7        0.07       99.98
        136 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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