Frequencies for first 10,000 rows of prescr1 variable in nhamcsed1997 dataset :

prescriptio |
   n status |
   code for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,631       46.31       46.31
          2 |      1,439       14.39       60.70
          3 |      1,031       10.31       71.01
          . |      2,899       28.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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