Frequencies for first 10,000 rows of prescr6 variable in nhamcsed1999 dataset :

prescriptio |
   n status |
   code for |
    drug #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        201        2.01        2.01
          2 |         31        0.31        2.32
          3 |         27        0.27        2.59
          . |      9,741       97.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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