Frequencies for first 10,000 rows of prescr2 variable in namcs1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,530       35.30       35.30
          2 |        452        4.52       39.82
          3 |        293        2.93       42.75
          . |      5,725       57.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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