Frequencies for first 10,000 rows of rx7v1c3 variable in nhamcsed2012 dataset :

   For RX7, |
 level 1 of |
MULTUM drug |
category #3 |
     (broad |
     level) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,988       99.88       99.88
        040 |          2        0.02       99.90
        057 |          9        0.09       99.99
        113 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016