Frequencies for first 10,000 rows of rx7v1c3 variable in nhamcsed2013 dataset :

   For RX7, |
 level 1 of |
MULTUM drug |
category #3 |
     (broad |
     level) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,979       99.79       99.79
        040 |          3        0.03       99.82
        057 |         17        0.17       99.99
        097 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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