Frequencies for first 10,000 rows of prescr1 variable in nhamcsed1995 dataset :

prescriptio |
   n status |
   code for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,748       47.48       47.48
          2 |      1,303       13.03       60.51
          3 |        842        8.42       68.93
          . |      3,107       31.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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