Frequencies for first 10,000 rows of prescr3 variable in namcs2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,443       14.43       14.43
          2 |        179        1.79       16.22
          3 |         92        0.92       17.14
          . |      8,286       82.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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