Frequencies for first 10,000 rows of prescr4 variable in nhamcsed1997 dataset :

prescriptio |
   n status |
   code for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        682        6.82        6.82
          2 |        133        1.33        8.15
          3 |         71        0.71        8.86
          . |      9,114       91.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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