Frequencies for first 10,000 rows of prescr1 variable in namcs1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,398       83.98       83.98
          2 |        907        9.07       93.05
          3 |        693        6.93       99.98
          . |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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