Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2002 dataset :

prescriptio |
   n status |
   code for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,623       46.23       46.23
          2 |      1,420       14.20       60.43
          3 |      1,256       12.56       72.99
          . |      2,701       27.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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