Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2002 dataset :

prescriptio |
   n status |
   code for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        902        9.02        9.02
          2 |        154        1.54       10.56
          3 |        136        1.36       11.92
          . |      8,808       88.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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