Frequencies for first 10,000 rows of prescra1 variable in nhamcsed2002 dataset :

prescriptio |
   n status |
   code for |
    adverse |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        298        2.98        2.98
          2 |         11        0.11        3.09
          3 |         38        0.38        3.47
          4 |         54        0.54        4.01
          . |      9,599       95.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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