Frequencies for first 10,000 rows of prescr2 variable in nhamcsed1995 dataset :

prescriptio |
   n status |
   code for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,611       26.11       26.11
          2 |        700        7.00       33.11
          3 |        377        3.77       36.88
          . |      6,312       63.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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