Frequencies for first 10,000 rows of rx4cat3 variable in namcs2009 dataset :

   for rx4, |
multum drug |
category #3 |
 - detailed |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,979       99.79       99.79
        197 |          2        0.02       99.81
        203 |         18        0.18       99.99
        270 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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