Frequencies for first 10,000 rows of prescr3 variable in nhamcsed1995 dataset :

prescriptio |
   n status |
   code for |
    drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,273       12.73       12.73
          2 |        266        2.66       15.39
          3 |        170        1.70       17.09
          . |      8,291       82.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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