Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2001 dataset :

prescriptio |
   n status |
   code for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        809        8.09        8.09
          2 |        168        1.68        9.77
          3 |        121        1.21       10.98
          . |      8,902       89.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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