Frequencies for first 10,000 rows of prescr4 variable in namcs1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        853        8.53        8.53
          2 |        109        1.09        9.62
          3 |         62        0.62       10.24
          . |      8,976       89.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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