Frequencies for first 10,000 rows of prescra1 variable in nhamcsed2001 dataset :

prescriptio |
   n status |
   code for |
    adverse |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        233        2.33        2.33
          2 |         15        0.15        2.48
          3 |         39        0.39        2.87
          4 |         59        0.59        3.46
          . |      9,654       96.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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