Frequencies for first 10,000 rows of prescr1 variable in namcs2004 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,109       51.09       51.09
          2 |        404        4.04       55.13
          3 |        320        3.20       58.33
          . |      4,167       41.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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