Frequencies for first 10,000 rows of prescr5 variable in nhamcsed1997 dataset :

prescriptio |
   n status |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        336        3.36        3.36
          2 |         60        0.60        3.96
          3 |         42        0.42        4.38
          . |      9,562       95.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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