Frequencies for first 10,000 rows of prescr6 variable in namcs1999 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        347        3.47        3.47
          2 |         54        0.54        4.01
          3 |         39        0.39        4.40
          . |      9,560       95.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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