Frequencies for first 10,000 rows of rx1v1c3 variable in nhamcsopd2009 dataset :

   for rx1, |
 level 1 of |
multum drug |
category #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,905       99.05       99.05
        040 |          1        0.01       99.06
        057 |         44        0.44       99.50
        097 |         40        0.40       99.90
        105 |          9        0.09       99.99
        113 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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