Frequencies for first 10,000 rows of prescr4 variable in nhamcsed1996 dataset :

prescriptio |
   n status |
   code for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        703        7.03        7.03
          2 |        116        1.16        8.19
          3 |        105        1.05        9.24
          . |      9,076       90.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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