Frequencies for first 10,000 rows of prescr5 variable in nhamcsed2002 dataset :

prescriptio |
   n status |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        495        4.95        4.95
          2 |         90        0.90        5.85
          3 |         71        0.71        6.56
          . |      9,344       93.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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