Frequencies for first 10,000 rows of prescr2 variable in namcs1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,877       28.77       28.77
          2 |        428        4.28       33.05
          3 |        230        2.30       35.35
          . |      6,465       64.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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