Frequencies for first 10,000 rows of prescr2 variable in namcs1993 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,977       29.77       29.77
          2 |        386        3.86       33.63
          3 |        265        2.65       36.28
          . |      6,372       63.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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