Frequencies for first 10,000 rows of prescr3 variable in nhamcsed1996 dataset :

prescriptio |
   n status |
   code for |
    drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,409       14.09       14.09
          2 |        324        3.24       17.33
          3 |        202        2.02       19.35
          . |      8,065       80.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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