Frequencies for first 10,000 rows of prescr1 variable in namcs1993 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,737       57.37       57.37
          2 |        480        4.80       62.17
          3 |        609        6.09       68.26
          . |      3,174       31.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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