Frequencies for first 10,000 rows of rx4v1c3 variable in nhamcsed2011 dataset :

   For RX4, |
 level 1 of |
MULTUM drug |
category #3 |
     (broad |
     level) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,939       99.39       99.39
        040 |          8        0.08       99.47
        057 |         52        0.52       99.99
        113 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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