Frequencies for first 10,000 rows of prescr4 variable in namcs1999 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        935        9.35        9.35
          2 |        116        1.16       10.51
          3 |         77        0.77       11.28
          . |      8,872       88.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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